My daughter wants me to build an upscaled version of her scratch-built QuadPod rocket. The easiest way to do this would be to buy a commercial airframe, but she wants to use 10" Sonotube and 4" mailing tubes. The rocket will probably be about 16' long. I'm intrigued by the idea of building a rocket with most of the supplies coming from Lowes, so I might be up for the challenge. Here's a pic of the BT60 version that she designed and built, and the smile that I can't say no to. IMHO...mccordmw wrote the Bible on how to build and L3 rocket with Sonotube: https://drive.google.com/open?id=1i4anunZXsiG7dyIP78nmFN7WJrSK-7uAgVvensHU9ok, but this will be even more complicated. I'm assuming that there would be a central 75 mm MMT with 38 mm pods--Likely flying on an 3-grain L motor in the center and some DMS H or I motors in the four pods. For starters, I have two questions (there will likely be more to come): 1) Attachment of the pods: They will stay fixed to the central airframe, but what's the best way to attach them. Of course I can use epoxy, but I was also considering rivets or some other mechanical method. 2) Nosecones: I'm sure I can 3D print suitable nosecones for the pods, and my printer is large enough to print a stubby 10" nosecone. I can fill the cone with expanding foam for some added strength. Is it possible to wrap a 3D printed nosecone in fiberglass?