While I didn't convert any of my cars into the GTA: Vice City engine perfectly — whenever I squished a bug I was having trouble with, another one came along — I still managed to drive around some of my cars in the game.
This last one was a modified version of my Ford Focus with textures borrowed from the game Colin McRae Rally 3.
Anyway, driving the cars I modeled in the game was really fun...
...but the process of getting the cars in there? Not at all!