I belive the smooth groups are fine, the render shadowing is a bit off (notice the windshield shadow going through as if there was no floor).
And now, here is a high poly model of the wheel (for normal map):
I did this to improve my skills. It's one of the civilian vehicle models for a mod.
The model is 4916 triangles. I might try making a texture for it and normal map the wheels later.
Simply because the headcrab and zombie are seperate models! :upstare:
You can use BSP2Zip to include custom stuff in maps and the changes will be visible to anyone playing that map.
This wasn't in PCG, but had you read the article about crates in games? According to them, the point you see the first crate is the point where the developers ran out of ideas. :rolling: