Hmm... It would be a lot easier to modify the back end of the X-Mod. Maybe go to your LHS and pick up some small sheet metal pieces (big enough to make a new back piece ... the one you detach to add the AWD in the back part ...). You would use the metal to make an extended rear end (w/o being too weak or anything) and then somehow move the motor back far enough for it to drive the wheels (perhaps have it mounted to the new metal piece?) As I'm thinking of this, I'm thinking that it will be a lot easier for me to make my mods than I originally thought... Thank you for making me help myself. The GT-1 body I have is like REALLY wide on the XMod chassis, but the wheelbase is almost a perfect match! I could do that metal piece (minus the AWD

) to fit the GT-1 onto the otherwise-stock XMod chassis... I actually have a piece of metal left from the chassis I made for the Humvee that should fit perfect for the extended rear end. I'll look further into this and let y'all know what I determine.
:::EDIT::: I think that a new metal plate (or rear sub-frame?) would be possible, though you would have to move the motor back as well. The motor would be the easiest part to do as you would just drill some new holes for the mounting screws.