So I priced some bodies... Cough cough....
After that I decided to raid my new body box, turns out I have a ford 650 body for the GST/Genesis. Has a 15" wheelbase, which I can accomplish by using the savage XL driveshaft in front, and the stock X shaft in the rear. That still gives me enough room for the lipo in front of the tranny, and I can use some regular size tires without the truck looking silly. Plus the overall size reduction over my previous plan will help out the power system.
So the current proposed setup will have similar specs to the savage xl, but will have a rear mounted tranny with the flux motor mount, and a forward mounted battery tray/servo mount. Not sure what tires to run, might get it all built and just go with what looks best.
Power system will be a 1515 2d on 5s with a MMM, or possibly a quark 125b.
I may still make a larger truck, but need to sell some stuff before I drop $70+ on a new body...