This is something I was wondering about. I’ve never built anything of this scale, but I have built some rockets that I wanted to be large in appearance, but very light. For those rockets, the “body tube” was really just a skin and didn’t do much structurally. For example, I’ve used card stock for the skin — it gave the appearance of a more substantial rocket, but it could have flown with just the skeleton which really provided the strength of the rocket. When I think of a 30” sonotube, 20’ long, wrapped in glass, it sounds like literally hundreds of pounds, if not more. Is heavy reinforced body tube the best way to transfer the loads? Or would it make more sense to build an internal wooden frame to provide the strength, and then tack on a lightweight skin?