restate your question it does not make sense.
no but there's probably a depth requirement
There are many insurance companies that will do this for you. Get the phone book out and start making calls. You should have no problem if the only "problem" is the diving board.
3 meters
Vjnyl, fibreglass, mosaic, tiles, marbelite or paint
Since the board base would be bolted to the deck then yes it is part of the overall structure. It depends upon what you mean by "structure".