I think it's a twin electric converted to an airboat, probably a scratch build. I think there are two shaft tubes still in there. The cockpit deck has been filled in at the rear, your topsides are not quite fitted fully in your pic, but it points towards a classic cabin cruiser that's been morphed.
I would guess it's value would be in the hands of the beholder. The fittings and controls are consistent with the seventies alluded to in the little emblem.
Do you want to get it going as an airboat? If you think scale instead of performance there's no reason why a .10 or .15 sized sports engine would not give some fun with that one