How thick and what material is the sheet metal? Is it something that fit and be machinable on a cheap 3018 CNC mill?
(Sorry if that's answered in your linked post, I skimmed it perhaps a little too quickly...)
(Sorry if that's answered in your linked post, I skimmed it perhaps a little too quickly...)
(I'd be able to make those, I would probably need to do it in a few passes though.)