Alright, the SIZZLER... I like it. *Seems* seriously deficient in bow buoyancy, but that might be offset by the aforementioned "wave slicing" shape... and the shape is what I'd expect in sheet aluminum--basically 2-dimensional--easy to fabricate without expensive mold-tooling... yep, not very likely you're going to walk or belly crawl out on those bows. But it's ingenious in a way, at least from a cost of production standpoint.

Mary, great evolutionary insight (over in TheBeachcats.com) on how the constraints of shaping sheet Al influenced the G-cats. I believe the Darts and boardless NACRAs also utilize that narrow-hull w/ fin-keel approach...? Would love to know the dates each first appeared on the scene.

... I was thinking more of a 3-sided shape, with a flat deck. Instead of foam, much weight could be saved by semi-conformal air bladders... pop a pressure gauge on your tires, AND your catamaran, lol. Not sure how to do daggerboards, if needed.

Also excellent metallurgical info from someone in the field, with a real world perspective on the labor angle. Lets face it, once you get your female molds made, there's a lot of gelcoat and resin sprayers from the board and boat industries you can put to work cranking out GRP cats... less so with leading edge whiz-bang Al seam joining.