Alcatraz had living quarters on it as whole families used to live there. It has a hospital, lots of rooms (
) and could become its own community. It has it own generators for power and you could get speed boats, gun ships, helicopters and more. Make sure that you have your people paired up in threes so that nobody is alone when away from the island and somebody is always watching your back. Full body screenings for everybody before they are allowed back onto the island and if suspect then they are put in a cell until the deadly period passes.
So Storm if you are set upon having this boat, don't becoming around my island or will sink that zombie infested hunk of crap.