I also put together the nose cone for the Raygun Gothic HoJo. A bulkhead was glued to the bottom of the birdhouse, the shoulder was glued over that, and a 2nd bulkhead was glued to the end. A long eyebolt goes through all three.
I don't need YA29mmR (yet another 29mm rocket) so I'm going to go for 4 x 24mm. I'll work on the rings and fins at Warthog's build session.