Mark One thought from some past research. If you fish the cockpit may be necessary, however when we had a 35MY Carver I looked at a 39MYCP, and relized they just add 4 to 5 ft. to the lower size to get there, so I opted for the 35 (not a fisher person) Docking was less, and in speaking to a few that had them, didn't use their cockpit much, cause the MY feature retarted any air flow to the area to sit and enjoy etc. Advantage would be if you are exposed to a number of floating docks, that would create easier boarding, and rear entrance. I also think you would have a smoother ride due to the extened hull, which will help your planning efforts.
Just some thoughts of previous times... How is it powered??