Make sure to use a Mini ITX board for the guts, they have built-in TV-Out. And I think you can hook the XBox's DVD drive up to it like a normal DVD-ROM drive.
Thanks for that I'll take a look. As for fixing the thing and using it as a X-Box and rom machine, the X-box is toast, not even the harddrive on it works the whole thing is pretty much fried. The reason I'm planning to do this with the case is because I have a new X-Box now anyway so I want to make something differnet with the spare case.
I've kept the fan and the power buttons with their connectors with a hope that I can sill make use of them. I did consider keeping the controller points to and hacking an X-Box controller but after a bit of thinking I want to make it a bit more personnel so I'll make my own controls to play on it.
So far all I've done is spoke to a few friends who I know are pretty good with eletronics and IT stff and I've competly gutted so if anyone wants bust X-Box parts let me know

The next step is to work out how and the cost, although I have a rough idea how. The current plan is to do it from nothing with a new motherboard, graphics card, ram, harddrive etc. Then I need to decide on which operating system to work it off, since I don't want to use Windows on it if I can avoid it, recommendations on which Front Ends make for the best Operating system when looking for ease of use and multiple emulators would be very helpful.
I'll update with progress as I make some and I will get hold of the digital camera from the factory before I do anything too major with it.
Thanks for the reply's.