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The wood doesn't offer much protection against RFI (radio frequency inteference) or ESD (electro-static discharge).Foil glued to all the inside faces of the wood might help, but at present it only has earth wires joining everything up.
A metal case is no good unless all the removable panels are electrically connected together at many points which will not be the case with painted panels. Also you would have to de-couple all the external connections with at least with capacitors to the metal case. PCs and all sorts of electronic items can emit a lot of radio frequency mush at all sorts of frequencies which can interfere with sensitive radios. The overall energy involved is small though.
Q1. traditional PCs are in metal cases, which act as a Faraday cage, but so-called modded PCs use a whole host of materials; do these ruin the screening properties of the case?Q2: In theory, would it be possible to make a case out of mesh (or a material with a mesh embedded in it - like the window on a microwave) with zero EM emissions?Q3: Are PC's unstable if separate parts are not all earthed to a chassis? (ie mainboard, PSU, HDD were just bolted to wood, say). [case designers must have to meet specifications I'm sure, but how problematic would such Heath Robinson systems be, huh?]Thanks!