I had a double thick cushion made when we redid the cockpit cushions, It works okay; but I have looked longingly at trawler type chairs with real back rests and arms. I would like to put one on Delicia someday. Mounting, clearence, bio-mechanics is complicated. I think it would have to swivel about 70 degrees to each side, lock on center, and perhaps be able to lift the arm rests. Would sure be nice tho.