[phatdaddy]

Hammer, not only through bolted, but would advise a backing plate of aluminum or epoxy coated plywood the same foot print of the pulpit. Like you , I worried about puting a hole in the roof of the cabin, especially for the deck pipe. I used an oversize pipe so the line would get out fast and go in easy. This would let a lot of water in from spray & rain. I put a piece of 4" drain tile as a conduit from the deck to the anchor locker. It works great, any water that gets in the deckpipe will go to the locker and to the bilge. I ve done alot of diving off of this boat and love it. I had center consoles before this and thought they were great, but the cockpit on the v-20 has a lot of room for dive gear. I installed 2 pop-in tank racks on the gunnels behind the seats, put 2 tanks in the deck fish box, and built a rack that will hold 4 tanks upright in the well in the cabin. That spread the weight around and left a lot of room for the other stuff. I also added a "handicap" bathroom rail on the cap above the swim platform and put a 3 step ladder on the the platform. The older you get the more you will appreciate this feature.
MJ, the ball is great, kinda scary first coupla times but you get the hang of it. I really use it because of the 25 ft of anchor chain , it gets heavy.