diff --git a/.gitignore b/.gitignore
index f9405ec..8cb5096 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 .hidden/
+.idea/
\ No newline at end of file
diff --git a/sessionzero-client/scenes/desktop/main_ui.tscn b/sessionzero-client/scenes/desktop/main_ui.tscn
index 546fb48..f342df1 100644
--- a/sessionzero-client/scenes/desktop/main_ui.tscn
+++ b/sessionzero-client/scenes/desktop/main_ui.tscn
@@ -1,6 +1,9 @@
-[gd_scene format=3 uid="uid://fy5iji5t58jk"]
+[gd_scene load_steps=2 format=3 uid="uid://fy5iji5t58jk"]
+
+[ext_resource type="Script" uid="uid://b6xurr0segcug" path="res://scripts/test.gd" id="1_ffwby"]
 
 [node name="MainUI" type="CanvasLayer"]
+script = ExtResource("1_ffwby")
 
 [node name="Panel" type="Panel" parent="."]
 anchors_preset = 15
diff --git a/sessionzero-client/scripts/helpers/datetime.gd b/sessionzero-client/scripts/helpers/datetime.gd
new file mode 100644
index 0000000..827ea3d
--- /dev/null
+++ b/sessionzero-client/scripts/helpers/datetime.gd
@@ -0,0 +1,37 @@
+# datetime.gd
+class_name DateTime
+extends RefCounted
+
+var _unix_time: float = 0.0
+
+static func now() -> DateTime:
+	var dt = DateTime.new()
+	dt._unix_time = Time.get_unix_time_from_system()
+	return dt
+
+static func from_unix(unix_seconds: float) -> DateTime:
+	var dt = DateTime.new()
+	dt._unix_time = unix_seconds
+	return dt
+
+static func from_string(input: String) -> DateTime:
+	var s := input.strip_edges()
+	if s.ends_with("Z"):
+		s = s.substr(0, s.length() - 1)
+	var unix := Time.get_unix_time_from_datetime_string(s)
+	if s.find("-") == -1 or s.find(":") == -1:
+		push_error("Invalid datetime string format: %s" % input)
+		return null
+	var dt = DateTime.new()
+	dt._unix_time = unix
+	return dt
+
+func to_unix() -> float:
+	return _unix_time
+
+func _to_string() -> String:
+	var dict := Time.get_datetime_dict_from_unix_time(_unix_time)
+	return "%04d-%02d-%02dT%02d:%02d:%02dZ" % [
+		dict.year, dict.month, dict.day,
+		dict.hour, dict.minute, dict.second
+	]
diff --git a/sessionzero-client/scripts/helpers/datetime.gd.uid b/sessionzero-client/scripts/helpers/datetime.gd.uid
new file mode 100644
index 0000000..fec6961
--- /dev/null
+++ b/sessionzero-client/scripts/helpers/datetime.gd.uid
@@ -0,0 +1 @@
+uid://b2k68if5pcfyn
diff --git a/sessionzero-client/scripts/helpers/guid.gd b/sessionzero-client/scripts/helpers/guid.gd
index f44a034..0476af8 100644
--- a/sessionzero-client/scripts/helpers/guid.gd
+++ b/sessionzero-client/scripts/helpers/guid.gd
@@ -1,12 +1,45 @@
 extends RefCounted
+class_name Guid
 
-class_name GUID
+var bytes: PackedByteArray
 
-var guid: String
+static func new_guid() -> Guid:
+	var guid = Guid.new()
+	guid.bytes = _generate_random_bytes(16)
+	# Set UUID version (4) and variant bits
+	guid.bytes[6] = (guid.bytes[6] & 0x0F) | 0x40
+	guid.bytes[8] = (guid.bytes[8] & 0x3F) | 0x80
+	return guid
 
-#func _init() -> void:
-	#guid = generate_guid()
+static func from_string(input: String) -> Guid:
+	var clean = input.replace("-", "")
+	if clean.length() != 32:
+		push_error("Invalid GUID string format")
+		return null
+	var guid = Guid.new()
+	guid.bytes = PackedByteArray()
+	for i in range(0, 32, 2):
+		guid.bytes.append(clean.substr(i, 2).hex_to_int())
+	return guid
 
-#
-#func generate_guid() -> String:
-	#return str(OS.get_system_time_msecs()) + "-" + str(OS.get_random_float()).replace(".", "")
+func _to_string() -> String:
+	var hex = ""
+	for b in bytes:
+		hex += "%02x" % b
+	return (
+		hex.substr(0,8) + "-" +
+		hex.substr(8,4) + "-" +
+		hex.substr(12,4) + "-" +
+		hex.substr(16,4) + "-" +
+		hex.substr(20,12)
+	)
+
+func to_base64() -> String:
+	return Marshalls.raw_to_base64(bytes)
+
+# --- internal ---
+static func _generate_random_bytes(length: int) -> PackedByteArray:
+	var arr = PackedByteArray()
+	for i in range(length):
+		arr.append(randi() & 0xFF)
+	return arr
diff --git a/sessionzero-client/scripts/models/datapack_model.gd b/sessionzero-client/scripts/models/datapack_model.gd
index 1e2401d..c92f371 100644
--- a/sessionzero-client/scripts/models/datapack_model.gd
+++ b/sessionzero-client/scripts/models/datapack_model.gd
@@ -1,4 +1,44 @@
-extends Object
+extends RefCounted
 class_name DatapackModel
 
-var guid: GUID
+var guid: Guid
+var name: String
+var version: String
+var author: String
+var license: String
+var description: String
+var icon: String
+var created_at: DateTime
+var session_zero_version: String
+var dependencies: Array[DatapackDependency]
+
+
+func _init() -> void:
+	guid = Guid.new_guid()
+	created_at = DateTime.now()
+
+
+func to_dict() -> Dictionary:
+	var deps_arr: Array = []
+	for d in dependencies:
+		deps_arr.append(d.to_dict())
+	return {
+		"guid": guid.to_string(),
+		"name": name,
+		"version": version,
+		"author": author,
+		"license": license,
+		"description": description,
+		"icon": icon,
+		"created_at": created_at.to_string(),
+		"session_zero_version": session_zero_version,
+		"dependencies": deps_arr
+	}
+
+
+# TODO: Implement this
+func from_dict(dict: Dictionary) -> DatapackModel:
+	var dp: DatapackModel = DatapackModel.new()
+	dp.guid = dict["guid"]
+	
+	return dp
diff --git a/sessionzero-client/scripts/models/datapck_dependency.gd b/sessionzero-client/scripts/models/datapck_dependency.gd
new file mode 100644
index 0000000..54a89bc
--- /dev/null
+++ b/sessionzero-client/scripts/models/datapck_dependency.gd
@@ -0,0 +1,19 @@
+class_name DatapackDependency
+extends RefCounted
+
+var id: Guid
+var name: String
+var version: String
+
+
+func to_dict() -> Dictionary:
+	return {
+		"id": id.to_string(),
+		"name": name,
+		"version": version
+	}
+
+
+func from_dict(dict: Dictionary) -> DatapackDependency:
+	# TODO
+	return null
diff --git a/sessionzero-client/scripts/models/datapck_dependency.gd.uid b/sessionzero-client/scripts/models/datapck_dependency.gd.uid
new file mode 100644
index 0000000..2547115
--- /dev/null
+++ b/sessionzero-client/scripts/models/datapck_dependency.gd.uid
@@ -0,0 +1 @@
+uid://hrv66ufdp4no
diff --git a/sessionzero-client/scripts/models/dataset_model.gd b/sessionzero-client/scripts/models/dataset_model.gd
new file mode 100644
index 0000000..9ca35a8
--- /dev/null
+++ b/sessionzero-client/scripts/models/dataset_model.gd
@@ -0,0 +1,21 @@
+class_name DatasetModel
+extends SzObject
+
+var dataset_type: String
+var entries: Dictionary[String, DatasetEntry]
+
+func to_dict() -> Dictionary:
+	var dict := super.to_dict()
+	dict["dataset_type"] = dataset_type
+	
+	var entries_dict := {}
+	if entries:
+		for key in entries.keys():
+			var de := entries[key]
+			if de != null:
+				entries_dict[key] = de.to_dict()
+			else:
+				entries_dict[key] = null	
+	dict["entries"] = entries_dict 
+	
+	return dict
diff --git a/sessionzero-client/scripts/models/dataset_model.gd.uid b/sessionzero-client/scripts/models/dataset_model.gd.uid
new file mode 100644
index 0000000..a0c0b03
--- /dev/null
+++ b/sessionzero-client/scripts/models/dataset_model.gd.uid
@@ -0,0 +1 @@
+uid://c8nua2p5okuvx
diff --git a/sessionzero-client/scripts/models/schema/data_field_value.gd b/sessionzero-client/scripts/models/schema/data_field_value.gd
new file mode 100644
index 0000000..8bf1c57
--- /dev/null
+++ b/sessionzero-client/scripts/models/schema/data_field_value.gd
@@ -0,0 +1,20 @@
+class_name DataFieldValue
+extends RefCounted
+
+enum DataFieldType {
+	TEXT,
+	MULTILINE_TEXT,
+	NUMBER,
+	BOOL,
+	FORMULA,
+	LIST
+}
+
+var field_type: DataFieldType
+var value: Variant
+
+func to_dict() -> Dictionary:
+	return {
+		"field_type": field_type,
+		"value": value # TODO: how do we serialize an uknown type here
+	}
diff --git a/sessionzero-client/scripts/models/schema/data_field_value.gd.uid b/sessionzero-client/scripts/models/schema/data_field_value.gd.uid
new file mode 100644
index 0000000..387941e
--- /dev/null
+++ b/sessionzero-client/scripts/models/schema/data_field_value.gd.uid
@@ -0,0 +1 @@
+uid://cfl5yreaugqde
diff --git a/sessionzero-client/scripts/models/schema/dataset_entry.gd b/sessionzero-client/scripts/models/schema/dataset_entry.gd
new file mode 100644
index 0000000..8759135
--- /dev/null
+++ b/sessionzero-client/scripts/models/schema/dataset_entry.gd
@@ -0,0 +1,32 @@
+class_name DatasetEntry 
+extends RefCounted
+
+var id: String
+var name: String
+var description: String
+var icon: String
+var top_level_fields: Dictionary[String, DataFieldValue]
+var groups: Array[DatasetGroup]
+
+func to_dict() -> Dictionary:
+	var groups_array: Array = []
+	for g in groups:
+		groups_array.append(g.to_json())
+	
+	var top_level_fields_dict: Dictionary = {}
+	if top_level_fields:
+		for key in top_level_fields.keys():
+			var dfv: DataFieldValue = top_level_fields[key]
+			if dfv != null:
+				top_level_fields_dict[key] = dfv.to_dict()
+			else:
+				top_level_fields_dict[key] = null
+	
+	return {
+		"id": id,
+		"name": name,
+		"description": description,
+		"icon": icon,
+		"top_level_fields": top_level_fields_dict,
+		"groups": groups_array
+	}
diff --git a/sessionzero-client/scripts/models/schema/dataset_entry.gd.uid b/sessionzero-client/scripts/models/schema/dataset_entry.gd.uid
new file mode 100644
index 0000000..37ef8a3
--- /dev/null
+++ b/sessionzero-client/scripts/models/schema/dataset_entry.gd.uid
@@ -0,0 +1 @@
+uid://c266t0ugcrkr
diff --git a/sessionzero-client/scripts/models/schema/dataset_group.gd b/sessionzero-client/scripts/models/schema/dataset_group.gd
new file mode 100644
index 0000000..e608f19
--- /dev/null
+++ b/sessionzero-client/scripts/models/schema/dataset_group.gd
@@ -0,0 +1,23 @@
+class_name DatasetGroup
+extends RefCounted
+
+var id: String
+var name: String
+var fields: Dictionary[String, DataFieldValue]
+
+
+func to_json() -> Dictionary:
+	var fields_dict: Dictionary = {}
+	if fields:
+		for key in fields.keys():
+			var dfv: DataFieldValue = fields[key]
+			if dfv != null:
+				fields_dict[key] = dfv.to_dict()
+			else:
+				fields_dict[key] = null
+	
+	return {
+		"id": id,
+		"name": name,
+		"fields": fields_dict
+	}
diff --git a/sessionzero-client/scripts/models/schema/dataset_group.gd.uid b/sessionzero-client/scripts/models/schema/dataset_group.gd.uid
new file mode 100644
index 0000000..e6d9280
--- /dev/null
+++ b/sessionzero-client/scripts/models/schema/dataset_group.gd.uid
@@ -0,0 +1 @@
+uid://cyr6ocjkgd6vm
diff --git a/sessionzero-client/scripts/models/szobject.gd b/sessionzero-client/scripts/models/szobject.gd
new file mode 100644
index 0000000..2c09dd1
--- /dev/null
+++ b/sessionzero-client/scripts/models/szobject.gd
@@ -0,0 +1,20 @@
+class_name SzObject
+extends RefCounted
+
+var id: String
+var name: String
+var sz_type: String
+var description: String
+var icon: String
+var version: String
+var schema_version: String
+
+func to_dict() -> Dictionary:
+	return {
+		"id": id,
+		"name": name,
+		"description": description,
+		"icon": icon,
+		"version": version,
+		"schema_version": schema_version
+	}
diff --git a/sessionzero-client/scripts/models/szobject.gd.uid b/sessionzero-client/scripts/models/szobject.gd.uid
new file mode 100644
index 0000000..8bdd77f
--- /dev/null
+++ b/sessionzero-client/scripts/models/szobject.gd.uid
@@ -0,0 +1 @@
+uid://c8co7n1xvfmou
diff --git a/sessionzero-client/scripts/test.gd b/sessionzero-client/scripts/test.gd
new file mode 100644
index 0000000..d6c72d2
--- /dev/null
+++ b/sessionzero-client/scripts/test.gd
@@ -0,0 +1,12 @@
+extends Node
+
+func _enter_tree() -> void:
+	var dp: DatapackModel = DatapackModel.new()
+	var dpd: DatapackDependency = DatapackDependency.new()
+	dpd.id = Guid.new_guid()
+	dpd.name = "test"
+	dpd.version = "1.0.0"
+	dp.dependencies.append(dpd)
+
+	var json_string := JSON.stringify(dp.to_dict(), "  ")
+	print(json_string)
diff --git a/sessionzero-client/scripts/test.gd.uid b/sessionzero-client/scripts/test.gd.uid
new file mode 100644
index 0000000..b233f78
--- /dev/null
+++ b/sessionzero-client/scripts/test.gd.uid
@@ -0,0 +1 @@
+uid://b6xurr0segcug