Won't that crab claw rig setup be a little 'interesting' to shunt out in heavy weather mid-ocean?  I can understand the pivot for the windward hull would reduce torsional loads on the beam in some circumstances, but surely the increased pitching due to the shorter hulls waterline length would overcome the capacity of the 'pivot' pretty quickly in the sort of ocean-going conditions the vessel is intended to undertake?  Surely it's easier/simpler/lighter to engineer the cross beam for the torsional loads of a fixed windward hull, than to engineer a pivot capable of handling the loads it would undergo when it reached the full extent of its motion capability?

Fixed hulls also take full advantage of the longer hull's greater resistance to pitching which definitely makes for a more comfortable ocean ride..........