Thanks guys, really enjoyed the build so far, actually had my first moment where I got so pissed off I had to walk off and leave it the other day though, I'd been chasing boost leaks for hours by blocking off the turbo inlet and the throttle body with a bit of jeans leg and some plastic bag under the hoses to seal the pressure in, and then giving it about 2 bar off the airline, and after about 3 joints popping off, I finally thought I'd got it. while I was nipping up one of the t-bolts on the last little leak "FUCKIN BOOM" one blew right next to my ear, I think I almost browned my pants whilst simultaneously flat braying my forehead into the most immovable bit of subframe possible. Gave in and launched the ratchet like an angry chimp, and went off to think of a way to get a bead on the end the aluminium pipes.
After swearing again when I saw the price of a bead roller I set about making this



Haven't had chance to test it yet, but I'm hoping to spin the pipes in the lathe and have the two bearings rolling on the outside of the pipe and then press the lever to push the inner bearing onto the inside of the tube, with any luck it will roll a nice ridge onto the end, other possibilities are that it will chew up the plastic outers on the bearings or it will break in some way and launch my hand/leg/penis into the unstoppable chuck, I'm hoping for a bead to be honest ;p