In the early '90s, Hobie Cat sold a 1-piece (really a two piece) tramp that was a miserable failure. You couldn't get them tight enough to provide the stiffness the boat needs.
BTW, Rick, the sheets rarely go through the lacings - at least on my boat. They tend to go over the rear crossbar if you don't practice good line management.
I'm sure that was the case with a solid vinyl case but with a bias cut mesh trampoline it should tighten up the sides just fine. As long as the mesh fibers in the trampoline are running at 45 degrees, when you tighten the trampoline at the back, it also tightens the side...kinda like those chinese fingercuffs.
