Alright thank you for all the advice.
My route I'm probably going to take will be an aluminum frame.
build a steering mechanism which I know I can do, probably use a servo for steering then.
Drive will probably be just rear wheels and I know my ways around gearboxes and motors so I may buy an electric motor and a separate gear box so i can change ratios.

my final question (at least at the moment) is how much could I get to run off 12 volt DC. Servos and stuff like that.
I have powered with 12V batteries before and I'm wondering If I could run it all off of one. (The motors, servos, and control components)