by Gecko » Mon Mar 04, 2013 10:41 pm
The first thing I would consider would be the common grounding.
In a metal case the motherboard is ground through it's mounting holes with solder covered pads for contact. Same goes for the power supply, optical drive and any other peripheral that mounts directly to metal that is connected to the motherboard
You might be able to use the existing mounting plate from your current case for the motherboard and then solder wires to the PSU and other peripherals threaded mount point, soldering to a threaded screw on the item and the MB mounting plate.
EMI shielding on the other hand might be a challenge if you do indeed need it. All components are already FCC approved for EMI so the only thing that might cause interference would be the CPU and if the heat-sink is on top the you should be OK.
If you do get some interference on wireless or maybe a wired device you will need to construct some type of metal shielding device.
As for noise, wood will be much quieter, wood is a good natural sound absorber.
The other things to consider would be good ventilation and air flow, metal is a good thermal conductor wood is not.