I've built and played my own didgeridoo's out of PVC. But I left one in the car on the playa and melted the wax mouthpeice! I like 2" PVC the best, but 1.5" works very well. Shape as you like with a heat gun. Somewhere I have jotted down the length for various notes.
http://www.wikihow.com/Make-a-Didgerido ... f-PVC-Pipe
I've been thinking of building a hang drum out of a propane tank. check it out
http://dennishavlena.com/for-webpage-lp-hang.htm