Damn, I'm so excited about this now that I made a custom fig today for it! I just need to pick up some super glue to put on a couple pieces and he's done! He's a sort of miner or other kind of physical laborer. I'm pretty happy with the paintjob, as I combined a wash with a drybrushing to get an effect similar to the great stuff Chewie does!
Edit: does anyone think it would be a good idea to standardize which vehicle base(s) people can buy, and then customize different models from it? For instance, everyone who will make a vehicle for this project could each buy the same GI Joe vehicle or some other currently available toy, and customize it to their heart's content, but it would still be recognizeable among each version since it has the same base. Kind of like on Earth we have multiple types of 4-wheeled cars, but they're all recognizeable AS cars.