I have refit my Tayana 42, and I can tell you, ladders of ANY TYPE suck. Build yourself a set of stairs 4' wide, with a landing on top at least 8' X 5'. Put a hand rail up both sides, and make the deck of the landing at the same level as the deck of the boat. Nail asphalt shingles to each step, and onto the platform on top. You will be walking those stairs a million times with heavy crap. build a post on a corner to hook up a come along or rope and pulley system to raise and lower all the things you do not wish to fall all the way down with. You will never regret it if you do.