ScarletVarlet: Seems like it would be a bit flimsy with Aluminium legs. OK for my mountaineering tent, which has to give a little in winds of 30 knots and stronger, but I wouldn't want to see that flexibility in a tripod. How about using Carbon tubes, which can be more rigid?
They do, but they're not all that cheap...e.g. http://www.fibraplex.com/tentpoles.htm