I built a deck extension on my Bumble Bee V16 last winter. I also replaced the carpet so it looks very uniform. I had a sheet of Advantek ( high end partice board). I don't really get out in the rain and the boat stays in my garage so I used it. I also coated it with water sealer before I carpeted. I do woodworking some as well so building the extension was no problem. To get the floor level I used a level across the section and measured from the top down to get it level. The extra weight in the front helped the ride quality of my boat as well.