ONLY from thick sheet metal? I hadn’t thought about that until now ... Good idea for further consideration. My locksmith/blacksmith friend doesn't like working with stainless steel material, so I have been assuming galvanized steel so far (which can be painted gray to black with a special very durable paint). However, that would mean that the part must first be welded, then transported into the zinc bath, and then lifted back again. Or I might forgo the zinc. Then I would have pleasingly more choice in colors, but such a paint must always be refurbished. Also, the sheet metal would have to be bent as precisely as possible before welding ... I think 3 millimeters thickness would be storm-proof ... below that I don’t know (from a feeling). Neither I nor my friend can bend thick sheet metal (for that you need a sheet metal bending machine). This machine would also be needed for stainless steel sheet. One could also provide a thinner sheet metal with an edge ... but that has the disadvantage that it "rattles" loudly when it rains. (if there is wood under the sheet metal, that somewhat absorbs it) Hmm ... do I want to think further about this? Thanks for the stimulus ... I also fear that the bend could not be made with a roll bending machine (as I know it), because the bend is "larger" on one side than on the other ...