missile help


Here is a picture of my jet pack and missle. The missle broke. I made this really fast, but now I have time to make the missle right. I used oil funnels. Is there a way to make the rocket more sturdy. I was thinking about using styrofoam cones inside the auto funnels and building the whole thing on a threaded rod, and altering the top of my jet pack so it would just screw in. I would also like critism on the jet pack body. The picture makes it look crooked. It is slightly askew but not near as bad as this picture. I won't be building a new one soon because I've got other projects to work on, but I do plan on making another one as soon as time allows. It's made out of sintra and various found parts. Any sugestions?