I think I'll probably be using a hole saw for the fan holes... I found the tool I was looking for and they ain't cheap. this is what I was after you drill a hole put this thing on either end and attatch a socket to one end to rotate it and cut the hole, they give amazing results that don't need to be filed or cleaned up at all with minimal mess... unfortuneately they're a little too much for me doing a single case mod :-P