onward
I think I ended up using every C-clamp I have
I also made an adjustable right angle to hold it square. If you're doing this, don't lure yourself into just welding it then pipe clamping it square.
weld a bit, let cool, dolly, repeat
once the outside is welded, I run a hot bead down the inside with an aluminum bar against the outside - it sucks the weld 'flat' with the top... less grinding to make pretty
woohoo, I made a tube
crack check, then baffles, sump, fill neck and finally end caps