These Gun tractors, especially the early cab versions are not the most common vehicles and detail information is rather scares. So I have a lot of fun studying factory pictures and other surviving trucks. It has a number of standard civilian parts and then bespoke parts. The chassis and nose was made by Chevrolet, the bodies was made by various coach builders. Mine is from Canadian top & body corp. But others where Steel Dump bodies by Gar wood industries and Gotfredson limited. I have been having fun finding correct parts for it around the world eg New Zealand, Canada and Argentina. Some NOS and some from wrecks. But a number of other parts like footman loops, roof hatches and condenser can I have had to make my self, and I still have a number of different things to make for it.