Why sketch up?? it will just double your work load. in sketch up: 1 model. 2. size. 3. paint. 4. save. 5. export. then you need z modeler. 1. import(60$registered version) 2. resize(again) 3. make an new uv map(as sketch up skin does not work in z modeler. 4. Skin it (again) 5. Export it(again) editor: 1. childs. 2. Superstructures(if needed) 3. lights. 4. commands. 5. save. Scripts. 1. type 2. test. 3 modify. 4. retest. and then done (and this is just for one model). it's no command just a tip for you guys. Start with Z modeler. You can get the same or better models out of it(and takes just as long as sketch up to learn it, (basic models). And it saves you 60$ and 5 steps on the model building progress. Just a tip EDIT: Don't take my post offensive please. Though the truck looks good now, you will encounter serious problems, getting it right in the game. As you need to use 2 different type of 3d programs. And 1 is actually no more then a architect program(sketch up)