The 4G sounds like your best bet then.
As Scott pointed out with the Datsun, there are tons of little old RWD Jap cars that would be awesome for a project like this.
Are you just speculating at this point or are you getting shit together? Another Colt build would be sweet, wish I could see what the old one looked like.
I am going to refrain from posting anything so I don't get myself in trouble. I'll leave it at this: I like my amendment rights the way there are now, and there are other things.