Modern designs with straight beams flex only 15-20 mm when layed up on their sterns and lifted by one bow. For us American friends this is 3/5th - 4/5th of an inch (or whatever other fractions you use !). i.e. without the rig on it.

There is no way you can get down to that with a raised trampoline on pilons. Your best bed would be to weld (all) the connections together and hope the beams are stiff enough themselves.

I do know that stiff platforms ride the waves noticeably better. I had an old Prindle 16 that became soft in the beam/hull connection. At one time I decided to stiffen these up. Once again I could fix the beams tightly to the hulls. The next day I went out it felt like the boat was reborn. It felt young again, agile, it glided the waves with ease. With gusts it picked up power more quickly. I was really suprised to find how much effect bringing back platform stiffness had and it hadn't been that soft to begin with.

Wouter