Time is something I have a lot of.  Not much in the way of brass sheet though.  Printing plate with a thickness of .011-.015 will work, but it likely depends on the alloy they're made of.  .011 is flimsy and would have to be handled carefully.  One charger I made from it works, but the tabs may not last long.  I got some .014 aluminum sheet off ebay that will not work, it'll break at a tight bend. I never did figure out how to size Parashooter's template right without wasting a lot of paper and ink so that I could make use of it.  It was easier for me to closely copy Paul's already made charger.