As with any project once you pull things apart you realize there is so much to consider when putting them back together in a new way. What I have figured out so far is having the hinges attached to the middle hatch for each of the wings will be the simplest way to do the modification. The downside to doing it this way, as breakaway pointed out, the whole thing will have to lift up together unless extra support is added to attach the hinges. This extra support will ultimately get in the way somehow so I don't want to do that. The other problem I see is it could be a real knee basher if the hinges are not buried very deep between the two hatches and padding. I asked my co-worker who has a Calabria and he has not had this issue but he also mentioned that his hinges are so deep in that the wings only open to about 85 degrees. On the MB boats they can open way past 90 degrees but they also stick up pretty far between the two sets of cushions.
Now if I go with the outside hinge concept this would be a problem with getting stuff in and out of the lockers while at the dock, or to get stuff to swimmers on the side of the boat. The other more technical problem is the outsides of the opening are curved with the lines of the boat, so a long piano hinge would not work. It would have to be two small hinges or something complex like the gas strut hinges on the other epic boats. I can only assume those are pretty expensive.
To Capt. Rick's point structure is pretty important. The guys at Taps Plastics assure me that 3/4" HDPE over the 38" opening will not deflect if only supported by the front and back water drain channels. His example was a 48/48" box that they made for a podium that did not deflect at all.
I am going to mock it up by cutting the existing piece of fiber board and figure out what works. These will be the patterns for Taps to cut up the HDPE, then just need to hinge it, and get new upholstery and foam done. I plan on aligning the seams on the engine side of the removable panels so when the hatches are open none of the aluminum engine structure will be exposed.
Opinions or ideas welcomed especially if you think of something that I am overlooking!