Well that will be interesting!
Many years ago I undertook the building of a violin from scratch. In order to accomplish the fairly tight curves in the ribs, the maple sides (about 0.50" thick maybe) are bent over a hot iron. You do this freehand, not over a form of any kind. It's actually pretty surprising how tight a radius can be accomplished with just localized heating of the wood and rocking it back and forth over the iron. Wonder if bamboo might respond similarly?
For what it's worth, my "iron" consisted of a short length of schedule 40 black iron pipe which I held in a vise and played a propane torch through the end. Worked great!
-frank