How about using window screening -- insect screening -- a couple of layers perhaps? That would create smaller holes than in grids I've seen that would block approximately gigahertz or cellphone frequencies.
I don't speak with any authority on this -- just throwing out an idea. The quote was "Most digital RFI is strongest below a few hundred megahertz, but strong digital noise can be seen to several gigahertz and above." How important is this several gigahertz noise -- excluding the noise from the processor -- and what would it interfere with?
I've been looking at net but it was rather expensive (~10-20USD for 1m). Atleast what I've found.
The typical peak EMI from a modern computer system is in the 300 MHz to 1 GHz range. This is usually suppressed by careful routing of signal traces on the motherboard, and coupling to ground planes within the motherboard. In PCs, the goal is to have essentially no EMI even with no case, since so many consumers compromise the case shielding for various reasons.
Great, then I simply ignore the imaginary need of shielding.
My current box is open and I haven't noticed any problem. Saves me a lot of work