Ply Bulkheads are laser-cut 1/8" plywood circles that fit inside our tube couplers. They can be used to make your own hollow bulkheads. A small starter hole is in the center of each that you can use to thread a screw eye through or to drill out a larger hole if desired for an eye bolt.
Just wanted to say, you folks are awesome! Your 29mm Sandhawk and the 24mm BBV are my favorite kits of all time and I can't wait to build some more. - Mikey G.