I'd pull the body off the frame. Remove the doors, hood, trunk. Brace the body in a few spots with some tubing. If you're going to scrap the other half, turn it on it's side, cut through the floor, turn it back on it's base, cut the rest. Cut long, trim away to what is needed. Cut the hood and trunk on a table or saw horses.
I can't see how a half a car is going to provide much seating, it's also going to take up a lot of space. It will look cool though.
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain