Mike, mine is actually THREE boards. The port & stbd are screwed in along with the upper back seat cushions / combing. The center seat sets on notched wooden supports screwed into the bases of the port/stbd seats and is removable along with the center back seat cushion held against the back fiberglass combing with velcro. The port & stbd seats remain (they're small but functional). Ron tells me this was an original set up made for skiing so you dont have to remove all the back seat - and I gotta say its pretty damn convenient. The center floor comes out along with the center section of backboard. The backboard fits snugly between the two port/stbd sideboards with the top sliding up between the back edge of the fiberglass & two (port & stbd) metal supports that hold it into place. Its very nice to be able to pull out the center sections of EVERYTHING when its time to work on the rudder, grease the rudder controls, exhaust piping, packing gland, etc.. I'll see if I have pics of the entire set up and post them.