New interesting problem, how to cover a boat that won't stand up Covering the catamaran's hulls they are 7" maximum width (each) and 16" tall. Normally I spread the fabric on the keel to center it and clamp to the gunwales with spring clamps, somewhat trickier when it won't sit on the deck

Also the deck isn't straight, the outer gunwale is angled to give increased paddle clearance. Right now I've got it spring clamped to the sawhorses, not real secure as the deck width towards the ends is considerably less than the 7" max. Hope this works. Boy these hulls are skinny

Bill H.