My condolences for your loss
Love the desk Where did you get the chrome hole "thingies" from?
I'm with Joe
http://www.ebay.co.uk/itm/80mm-Brig...-Desk-Tidy-Brush-/370309824380#ht_2095wt_1270
****ING HELL!
You could mount the plug adapter either on the back support or upside down under the desk. Then use those brackets (currently holding the plug adapter) to support any training wires.
Also, if it were me, I would consider channeling the network cable into the wall and have a faceplate on it.
Great work so far though.