I have sailed both styles since the mid 70's, I still think attaching the beams to the hulls is the best way. I have seen many a Hobie 16 with the pylons down in the hulls, and in some cases there where as much as 2-3 inches difference in the distance between the corner castings and the hulls There are far many more moving parts when you place the tramp on the raised platform. 4 corner castings, 2 side rails, 4 pylons, mostly held together with rivets. When I lift even the best maintained Hobie 16 from 1 hull there is a few inches of movement before the other hull starts to raise, and in some cases many inches. If I lift 1 hull of a P-16, both hulls start to raise at the same time. Just my opinion