Re: Is this aluminum boat repairable...usable
Not sure what the history is of that boat, but if is being sold hull only, with no motor or trailer, then it may have been an insurance write off, with a hull too badly damaged to repair. The motor and trailer would have been sold separately. For $800, you should be able to find a solid hull which does not have major damage.
The process of removing the floor involves extensive work, as there will probably be pour in flotation foam inside, plus wiring, above floor storage boxes, livewells, and other mechanical systems which will need to be moved. It isn't likely just a case of undoing a few screws and popping the floor out.