Now is the time for texture fixing. This is not very common, but sometimes the textures don't!
On this Skyline, my 5% tinted headlight covers texture are totally opaque, so I open them in Photoshop, and guess what? No tint! So I re-tint it, and I find out that at the time of this tutorial's writing, Photoshop 7.0 had a bug in the TGA exporting, and wouldn't let me get the Alpha channel out with the texture. So I took another texture from another car, alphatex, and renamed it to tint05w.tex.
Once you are done painting yourself nuts, you can move ONWARD.