Two usb ports in the original keyboard jack wouldn't look too out of place. and they are pretty easy to salvage from any junk x86 pc case. Dell machines are usually a great candidate for the two ports, and I've seen plenty of this machine die over the past few years..
for the life of me, I can't figure out why I feel a slight urge to paint the chassis in some sickly electric green hue . . . :
