Post-Apoc Car Mod?

[spilth]

I was wondering this morning if it would be possible to overhaul the graphics and data enough to create a post-apocalyptic car combat game out of WW.

The nebula could become mountains or rought terrain. Stars could become counties and Planets become towns. Ships would become vehicles.

Do you think enough things could be replaced without touching the game engine to do a total conversion like that?