I would agree with the 5-8 mph, and agree that the handling would greatly improve........ in all but one area!. The SSM drives have little or no planing surface and have a tendency to invite blowovers to the novice. A good throttle man with a well tuned ass will be wise to this before he/she enters the no no zone.
Thinking about this a little ( my head hurts from the Montreal Grand Prix ), if a pair of old Merc MC1 case could be found, it could easily be the HOT setup on a skater.
Diamond Marine in Ft Lauderdale can make adapter plates, I would have them aerate it to improve time to plane.
T2x, do you have any more pictures of the WING?