Have you read
"The Frame File" by John Alexander?
http://arcadypress.co.uk/paypalshop/1_P ... _Judy.htmlAluminium frames are normally built using some variation of the lazy tongs design but with metal substituting the wood. Aluminium, in my experience, produces an inferior fit-up when compared to wood. The reason it is chosen is that it is thought to be lighter than wood and this is not usually the case. Even if it is lighter it is not sufficiently so to counteract its disadvantages - the main one being that it is vulnerable to bending. For example an aluminium booth is not good in wind where the fit-up can suffer quite a bit of twisting. Or if an ali booth blows overthen it is more vulnerable to damage and strain than wood, and more difficult to repair.
But I won't talk you out of it, most of us have to discover these things ourselves. So consult the Frame File and have fun.