Roamer, this is the most amazing example of a DIY BHAG (Big Hairy Audacious Goal) that I have ever seen. Either you have an encyclopedic knowledge of both boats and fabricating, or else you must spend almost as much time on Google as you do working on the boat!
But you don't strike me as the kind of guy who would enjoy spending all your time sunbathing and otherwise lolligagging on a cabin cruiser! So my question is, are you going to actually use this thing? (The mind does boggle at the sheer babe-magnet potential)
Or will you sell it, and then do it all over again on an even bigger one???