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The photo of the design is from a CNC company website who make them using CNC.
https://malek.ae/cnc-cutting-solutions/mashrabiya/mashrabiya-square/
But if you look at their photos you see they're not perfectly sharp edges... https://malek.ae/wp-content/uploads/2017/08/Al-Malek-cnc-cutting-solutions.jpg
It's good enough though. Especially if the production is relatively cheap and I can have a carpenter provide finishing and detailing.
Bear in mind that if its CNC routed the tightest internal radius of a cut out will be the size of the cutter, probably 12.7mm, so no sharp corner triangles. If it’s laser cut (what I’d suggest) that’s not a problem.
Solid walnut is not a good idea from a cost / durability perspective. Walnut veneer 6mm ply would be better. Veneered MDF would be even more “dead”, and probably easier to source than veneer ply that thin.