Sounds so simple hm? Shows how much thought you actually put in to things.
Screw it, why not just take your uni-body Grand Prix and weld it straight onto the frame for something similar to this.
Because thats about the most awesome thing I can imagine. That thing would out handle any STi or Evo. Or you can just cut strips of your floorpan out so the frame of your POS car takes up all the room where your feet go. Thats okay though, who needs leg room?