Max, Tahoe DemoCenter says there is no plate with the MOJO and The Tyrolia website
http://www.tyrolia.com/index.php?useflash=false&l=2 bears that out.
I am with you in wondering if a riser/lift/plate etc. would be a good idea on a wide Powder ski. I did talk w/Chris at the Dumont Skunk Works (the monicker SCSA gave them...which I think is so cool...) and he opined that a lift would probably be benificial to aid tipping a ski which is so wide under foot. Sounds right to me but....???? I am planning on skiing them as is and then deciding if I want to put a lift on them. It would be great if some folks who may have experience w/"Fattys" with and without lifts would chime in here.
The 88's are full on race ski laminate wood core construction, and appear to be exceptionally well made.