Been working on the Samurai for a couple weeks.
1. Chopped the entire body off behind the seats, then made a 'tub' out of fiberglass (no rust).
2. Used 2' foam panels sandwiched in fiberglass/epoxy.
3. Bondo and fiberglass around the doors.
4. Final layer will be one or two layers of black carbon fiber.
5. Windows and back door will be cut out and added after the carbon.
This thing is super stiff already. When you push on it from any angle, the whole vehicle moves. It's also very light. Certainly no more than a stock Samurai with a fiberglass enclosure.
Still have a ton of prep work to do before laying carbon. Things like making the corners as clean as possible, making a solid wheel flare to cover the 1" of tire hanging out past the wheel well, sanding, and more sanding.
These flares over the door are/were a difficult. Tons of time in them, and a ton more to finish them up before carbon.