Look for a wrecked John Cooper Works MINI. They don't have rear seats.
Oops. Probably fewer wrecked GP's available than JCW'sI thought that was just a GP thing.
You wouldn’t do one of the “kits”?Yeah that's just a GP thing.
Rear seat delete will be my first mod if/when I get an SE. I did that on my R53 and it turned out really well. I made my own platform to sit where the seats were. Plywood, a couple pieces of 2x4, wrapped in carpet. It was really easy and increased the usuable space for camping by quite a bit.
The batteries partially exist under the rear seats, so you can't lower the profile much. I'm not sure removing the padded seats will save enough weight to make a noticeable difference on range. Plus when the seats are down it creates a flat cargo area, so a good liner or pad would have close the same effect as a seatless GP.
But to try as a fun project? Go for it. Just don't be disappointed by the battery location.