Google sheetmetal for your town. Or ya wanna tel me where you live and I'll do it for you.... Come onnnnn.......
Not to be a jerk, but some of the questions posted are straight up silly. Too much hand holding anticipated for male adults. Like people dont look, just ask, because we're obviously entirely too convenient.
Non-galvanized, 16-14 guage, where? I don't know your town... And your gonna blow holes every 3 seconds unless you tig, gas, or braze. A flux core lincoln from Home depot will just frustrate the crap outta you.
Good luck
I know... Jerk-ish...