This is a 1981 56' Hatteras FBMY. Do a search on the Great Loop and you may find more pics from our trip that might help. We fretted about having it hinged (very expensive) and opted to have the guys in Albany Y.C. take it down while also changing our zinc anodes over to Mag. Wasn't till we got to Oswego and put it up that I realized that the job was no big deal. A tall guy in the middle or one on either side to hold it up while another puts in (or takes out) the bolts. Those shark fins really help line things up. The supports I made are 2"x 6" pressure treated lumber, a piece of PVC pipe cut in half and outdoor carpet wherever it touched fiberglass.