Dimensions would be really helpful right now, as I'm willing to look up part sizes, etc. for you.
EDIT: Looks like it's exactly 9.6" wide, the size of a mATX motherboard. You may or may not be able to fit it in there, but godspeed. Also, you'll basically have to rip the back of it off for expansion ports and an I/O cluster.
EDIT AGAIN: Looks like you'd have more luck with a Mac Classic, which is marginally wider, so you could probably fit the motherboard in.
MORE EDIT: Mounting the motherboard sideways is potentially an option. However, that still leaves you with the problem of expansion ports, cutting open the back for an I/O cluster, 5.5/3.5" drive bays, and whether or not there are actually any LCDs that would fit in screen slot. You've really got your work cut out for you.