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Hey, that’s wonderful!
If you use aluminium, you should get it anodized once you get the finish right (there might be some sanding and polishing). If you can go trough the trouble, it should resonate quite well, and give some weight to the sound. If you can afford it, order at least one in each material (you are experimenting, right?). Stainless steel or brass could do without coating, but they are much heavier.
This is the reason I joined this forum, it’s really nice to see some development on this instrument of humble origins!