Yeah tig is the ideal, but i don't currently have access to one outside of work. I've got a guy at work that will do it for me (one of the best welders in australia, dead set he could just about weld aluminium to steel!) when i can take it in..
Benny is looking at getting one so if he does i'll get dutto to do it for me. (Dutto works for benny full time now on the race cars and he's a welder by trade).