I'm still building mine, drafted it in sketchup. I'll be doing a mini pin, already have the monitor (think it's 23", but now can't remember), and will just be using an external computer. Basically, using the cabinet as a sort of peripheral.
I started cutting my cabinet, but had a pretty severe allergic reaction to the MDF. I'm trying to get my dust collection system in place and a better mask before I start that again.