Current and recuring topics seem to be: Cheap, small yet fast boats, Advances in Weight Reduction, and Hull design.
With this in mind it may be beneficial to revisit catamaran thinking.
Traditionally wider and longer was the path to more horsepower and less drag respectively.
Wouter was brave enough as ever to suggest the benefits of 16' might outweigh the waveform drag reduction of 18'... or some such heresy.
Furthering this is my guestimation that at Beachcatamaran speeds, displacements and lengths, two hulls should be less drag than one.(waveform drag reduction is more than the increase in wetted surface drag)
Initially it would appear this is not the case because of the success of the wild-thing. However, remember that a catamaran hull is shaped to take the full "weight" on one hull. As such it has the wrong form for minimum drag when displacing half the "weight". Perhaps we should examine two hulls of combined displacement only capable of floating the boat. Perhaps they should be only far enough apart for stability and no negative wave interference, and Combined with racks for righting moment.
The benefit of the hull righting moment is diminished with light hulls and heavy crews. The pitchpole, weight and rigidity, and trailering problem is worsened in some ways by wider beam:
Pitchpole because of the sail location and line of action of the sail force when off the wind.Weight, rigidity and trailering ability for obvious reasons.
Also remember that you are now only having to build hulls with half the traditional volume, which can change a lot of things (labor,method and expense) when the hulls are already small.