Following James' link to a show at Bournemouth on youtube I came across this video of a booth design from America produced in aluminium....
http://www.youtube.com/watch?v=uk1Y8yhUFE8
They are at:
http://www.opendoordesigns.ca/PPT.html
It's obviously suited to indoor use, but it's nice to see other people's approach. I think I'd always prefer to work in wood, it's technologically simpler, very forgiving and easier to repair.