first u will need the objects full data structure, identify the following:
Objects Code, including physics,soundscripts, geometires and effects code.
StandardMesh, including all parts and thingies
Texture
Soundfiles (these are mentioned in the soundscripts)
to get the vehicle into a map u need to run them via a command in the init.con
important to know is that StandardMesh files (code is geometrytemplate path) have /archives preset as root folder.
for reference u may want to look at the Airwolf Map from Pferdefriedhof.net,
it has a KA50 implemented in a modified gazala-map.
Look through the con.s, starting at init.con and follow the path.
Keep in mind, this is a client-side modification, u cannot call a vehicle from another mod or map serverside if its not included in the Mods init.con.