You can do fine detail with silkscreens--you just need one with a fine mesh.

The problem with trying to recreate those speaker grills is the graphic in the pyramid. There's a lot of detail missing due to the speaker grill holes.

However, that same symbol is used on the side of the cabinet, so you may be able to scan that, turn it b&w, and shrink it down.

Same problem, one is rusty on my Stargate but the problem I already talks is about colors...I'm pretty mine are originals but have copper red color for the pyramid, you might take speakerd grid on a hold blaster cause there made of metal toile original ones

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I could make these , including the symbol in the middle. I wont be able to do the fine detail in the middle, but I could reproduce them very closely. I just need dimensions and screw hole spacing. The ModFather

Vectorize, cut a stencil out on a vinyl cutter, spray paint.
Modfather is also a good dude that does good work!

Pretty sure that they are made of metal...like old ghetto blaster...otherwise they will not be rusty

Thats exactly how I am going to do it.