Wanted a fun climbing structure for the new kid to play on. Turns out its fun to play under too. Doubles as a fort too.
Strong enough for me to stand on without any shifting.
Made it from 1 inch PVC then covered it with foam pipe insulation and then duct tape. Only the two main rings are glued up so the whole thing will come apart if needed. The top is just a piece of plywood that I padded and upholstered.