This is an awesome discovery for those you (like me) to own a "Hang Drum" by Panart, but can't afford to buy one (last one went for $6K on Ebay).
Dennis Havlena, a legendary DIY instrument maker has invented a poor man's version of the Hang Drum, made out of a new propane tank. You can check out the building instructions on Dennis's website: http://www.ehhs.cmich.edu/~dhavlena/for-webpage-lp-hang.htm
There are also several video's on YouTube of this instrument:
Here are some of my favorites:
Here's a ebay auction of a custom one: