Okay, I have some pipe now! How did the soaker hose work for a plasma guide? I've got some sch20 24" pipe and it is 3/8" thick. My little tiny plasma will not pierce that, but I can edge start. I think I'll drill a start hole and then plasma cut it using your soaker hose guide idea. I like that!

BTW, .375 wall is going to be awesome once it is complete, but it is very heavy and bulky!