Re: Mounting of router
 

It looks like Fate has intervened on your behalf.

Please use polycarbonate (Lexan, Macrolon, etc.) rather than acrylic (Plexyglass). The acrylic sheet will shatter easily if stressed and especially if it is subjected to shock (there are other threads here about this). Polycarbonate is very resistant to shock and in the rare instance when it does crack, the cracks propagate slowly. You can get polycarbonate sheets from your local Home Depot or Lowes store.

Velcro and zip-ties are all you need to hold the router onto your polycarb plate since it is so light.

Re: Mounting of router
 

A rule of thumb I was taught for low frequency antennas separation should be a minimum of 1 wavelength and 10 wavelengths or more was ideal. (for non resonant metal objects) That will at least give the least amount of detuning of the antennas. At 5.4 GHz the wavelength is about 2.6 inches. So I would recommend that both sides of the radio have no metal within two inches. The antennas are almost centered in the box so they are about two inches from the front and back of the case.