The build doesn't have to be from a kit, it can be scratch built. You have a lot done, but if you were to cast it in resin it would amount to the same starting point for someone else using the resin conversion. I don't have a problem unless someone else does, so I'll put you down. The main reason for rule #5 is keep anyone from having a big head start. The way I see it, you are starting with a cab conversion that you've mastered.
However, If anyone who is entered into this contest has a problem with this entry, please send me a private message and we'll discuss it further. I want to try to make everyone feel like they're being treated fairly.