Here's a video I've had around for a while... one of my 4-H kids designed and built a rocket using heavy-duty BT-70 tube and a 3x24 engine mount. The video is the first and only launch, on 3x E9-6 engines. It was really cool. Many people said it wouldn't survive flying, or wouldn't fly at all, but the simulation said it would and it did. Drifted 2000' back into town, though... we really didn't know how to size the parachute, and it appears that 52" wide is a bit too big.
[YOUTUBE]gFg-uCV5WuU[/YOUTUBE]