I went into an auto parts store once, I believe an Autozone and some guy there asked me if that Jeep Cherokee was mine. I said yeah, I need to get some parts for it. He said he actually made a full-framed Jeep Cherokee out of a Chevy frame, cut out the unibody and reinforced it I believe. I'd love to do that to an XJ but I have no idea if that would work. Well as far as the structure goes, you can put whatever body you want on a Chevy frame if you feel like it.. there's a guy on some other forums I'm on that had a Geo Metro on tractor tires...