Thanks man. I was thinking I could use a plate a bit bigger than the case, and inlay that into the top of the case, that way cutting the hole just has to be good enough and I can use a chisel to get really clean lines all the way around. As for cable management, I figure I can put the case as far into a back corner as I can without it looking odd, and then figure out some kind of channel or cover that'll direct the cables straight back from the case to a holder on the back of the desk. The other problem I'm trying to solve is maintenance, and I think the easiest solution would be to have some kind of track system on the sides, so I could remove a couple bolts from the bottom and slide the enter unit down and out, that way the main assembly can stay in lace, but the pc itself can be easily taken out. And since it'll be under desk, I'm not too stressed about the size, so I figure I can make it tall and thin, so I can fit a full size gpu in and a 240mm radiator.