I'm filling out my collection of SW pep helmet models. My latest is the donut for the ROTJ Endor Rebel helmet. Some trimming will be needed on the inside edges and possibly the top of the donut, but I modeled them for support while glassing, so they can be removed altogether after most of the fiberglass and bondo work is done. If anyone knows the proper dimensions, I can definitely use the info so I can release the scaled model.
I may decide to extend the lower part of the donut into a solid piece like some of the kits I've seen. It may be easier to fit it to the cloth cap.