The Total Composites probably makes a decent camper, but boxy. I've drawn my camper in a number of variations, and slightly bowing the side and roof, and radiusing the corners, make it look a LOT better. Even the Bigfoot benefits from the slope of the sides. If you are going to all the trouble, you might as well have nice aesthetics.
On the right, square corners, middle rounded corners, left rounded corners and curved walls. The curvature is the same for walls and roof, so making a simple curved ply surface you could layup a composite sandwich for all of them on one mold. A second mold would add the corner radius, again laying up lengths used for all the edges. The corners would need to be individual molds, or the lost foam process. It would not be as fast as Total Composites build for sure, but also (for sure) would look a lot better. You could achieve the middle look with the TC panels, and just make the corner radii.