These cases are available for purchase on ebay because they came from stripped G5 computers that were in non working condition. Instead of throwing the thing away, the cases are sold and then the working parts as well.

You might have a look in the mod guides at some of the other mac case conversions. There may be some usefule info there for you. Would love to see you do a mod guide on this when you are finished. I think that I have seen this done before. Can't remember where I saw the mod though :dry:
"Fix it 'til it Breaks."

Jacob - EiC & Director of Technology
Mac Pro Quad 2.66 - 4GB RAM
160 GB SATA RAID 1 - 650 GB Storage
Quad 19" Widescreen LCDs
Accessorized to the Hilt