made the corrugations with a small jig i made with some al. u channel - it is 3/8" x 1/2" +/- - used wing nuts and bolted it to a piece of ply with a cutout in it for the longer side of the metal. folded by hand and then 'burnished' with a stock of al.
was a pain - but worth it to see it come together. after doing the first one i can see improvements to be made to my jig - which might speed things up.
dual flame burner? i'd love to see it.
i'd also love an old bridgeport in my garage... (and a lathe, a press, drill press, bandsaw.. etc.)
been looking online at al. components and pre-manufactured bottles / tins / etc. found a few places of interest and if i luck out i'll post some links. hoping that some 'prototype samples' come my way.