Cheers for all the info Mr Mikuni, I really do suck at finding stuff, haha, hopefully this helps others out also. I did notice the new rules coming into effect in Jan 2011 regarding main hope dia and so on, makes me wonder about people who are half way through building a car to the old spec and wont get them homologated till after that date, I know of two people in this boat. Also, I agree, it looks a lot easier and cheaper to go through this process then I thought, and luckly I can get my hands on a proper tube bender, so will make it that much easier.
Also, I priced up the tube through steel & tube in TGA, this is what I was quoted,
44.5 x 2.6 (the only seem to stock it in 2.6mm) comes in 4m lengths = $77.85+ per length ($19.46+ per m)
38.1 x 2.6 " " comes in 5.5m lengths = $75.00+ per length ($13.63+ per m) (also, these length are 12.4kg/2.25kg per M)