Mike,
Thank you. It was countless hundreds of hours and thousands of dollars. But we have sold over 50 of them so far without even trying. Interesting that the 1945 Adverts in Australia are for a battery that in the US was succeeded in 1939 or so by the Safety Fill, patented in 1938.
As to laser cutting/engraving:
I've drawn up CAD files and sent them to our local metal supplier to have tail lamp brackets or blackout switch covers made. I then did the bending on a shop press. At the other end of the spectrum, with a home/hobbyist laser cutter a friend has been making the Canadian 24-hour ration boxes to fit in the mess tins and use the laser at the lowest setting to put the lettering on the paper. As long as it's black you want it's an alternative to letterpress.
Matt
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