Looking good, but I've just had a thought you might be interested in. If you're gonna be connecting both the PC and the 360 to a network, why not get a cheap little network switch inside it too to save having two network cables running to your router.
Ah, the Mega PC, that takes me back. I remember seeing one in a shop when I was a kid thinking it would be great. Sadly my Dad wasnt as keen for some reason...
PK!