Hmmm. Well that’s curious! I don’t think mine is unique…pretty standard ketch with one head. Nav station by the aft companionway, just to starboard. On mine, the hanging locker (wet locker) is basically part of the engine bay. Only thing separates the two spaces is pegboard. That is relatively easily removed. Opens up access to the left side of the engine (since the engine faces aft) and also opens up access to the front of the engine. My vessel is a relatively late model, #189. Perhaps the fiberglass you are looking at is a removable panel?
David