I wonder if anyone can give me advice on retro fitting buoyancy foam to a flying fish snapper. My new (old craft, recently acquired by me) craft was built as a "land only" model by Flying Fish for their events business at the time. I'm currently doing a bit of work on it to make it the best it can be and have currently got the engine in bits (another story...) and while I'm waiting for parts would like to do a bit more work on the hull. I'd like to add floatation buoyancy and wonder if anyone has done this before, either with blocks of foam or with expanding polyurethane. If so, any guidance on where to put it and how much would be very much appreciated. Also, should there be drain holes in the bottom of the plenum to let any accumulated water out? I'm very new to this so forgive my current ignorance, but very willing to learn!