I think the new JConcepts cab-forward shell debuted at the worlds might fit the X - 6 pretty well. It fits on the longer B4 chassis they've been running recently which means it could sit well on the X - 6 with a little creative trimming.
I would emphasize that I've not seen one in person or even studied the pictures all that carefully, but I'll be taking a closer look when I can.
__________________
|