What does a hand held plasma cutter have to do with sustainable houses? Have you ever wondered how people do clean cut outs when they modify a shipping container? An opening for a door or window? I think this info page from Miller is awesome. Look at the pictures and check out the roller guide for even straight cuts and one for circular arcs. That's ingenious. I get it... One more thing on my "have no clue what to do checklist" ticked off. Cool.