Freddie,
We had a guy come up here from the Bay Area to have a car made and he weighed 350 pounds at the time. They made some modifications to the tranny tunnel and seat and floor pans and he was able to get in and out pretty easily. Of course that bench seat in the Cobra looked a little odd at first.
Of course since you are so much into sailing, you could replace the tires with pontoons and put a sail on it. That should get you some looks as you go sailing out of the harbor.
Ron