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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.
dbr-
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.
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tightest internal radius of a cut out will be the size of the cutter, probably 12.7mm
In wood, you can rout at least 4×D, so in 3mm material you could use a 0.8mm bit to give 0.4mm internal corner radius, which is effectively a sharp corner visually.
Velocio
gbj_tester
Whilst I still await the samples to be delivered... I came up with a different idea.
The idea is a wooden speaker grille... all of it a single piece of wood.
The attachment shows a mashrabiya panel that would allow 50% openness. I don't need this level of complexity to be an effective cat guard. The centre can be opened a lot more and on the Tannoy that's where the tweeter is. Making the middle hole larger is the goal and pushes the openness to 65% which beats most perforated metal speaker grilles.
So I've sent out a request for a quote for a single piece of walnut CNC'd panel where the speaker grille is actually a mashrabiya design. As it's all a single piece of hardwood I believe that the strength of it would be quite high, and that it won't be possible to be a source of vibrations either.
And if the company is crazy good at CNC then I'll ask them to taper the rear so that the cross section is actually a triangle and it should sound even more transparent. I mean... obviously I'd do something stupid like that if it's possible.