I wasn't really thinking of hull speed. I was just trying to envision the boat with the Nacra 6.0 center hull and I'm thinking it would look pretty spectacular! I think your biggest issue may be space for you to sit in as the 6.0 hull, although not terribly skinny, is still not wide enough for a regular person to sit in (although we're both probably slightly below average in this regard). You might have to open it up a little for the skipper's area. That and the insides of the hulls will need some finish work because they are pretty rough and not skin friendly. I think it's an awsome idea though and these hurdles are pretty minor. Just need some glass work, a forestay attachment point, rudder mount, and some hardware.

The original rotomolded hulls have an aluminum skeleton inside them don't they? How much of that would need to be rebuilt?