well, here's half of my cars (the sats of all cars, not the skins yet)
Put the files in the zip into the gta3\data folder, make sure you back up the orginals.
These mod the colors (of most of them), the handling (suspension, height), and what car has what type of tires.
explanation of files:
carcols.dat-the car color file
handling.dat- suspension mods
default.ide- changes what car what what tires, although not nessacary until i post the skins, but go ahead anyways.
i'll try to post the skins for my cars later, i have to convert them from bmp to jpg.