HI Dave. Here are a few pics. of the cabin and rear deck. I have no idea if they are correct as I have been unable to get a copy of the original drawings. The cabin top fits into a coaming / channel and is held in place by a rubber band, you can probably see the hooks in the photos. The rear deck sits on a ledge. it does not appear to be very watertight but seems to work quite well. Hope this helps. - John