So, you are looking to put 3 powerbooks inside a custom built case. From there have each computer display a different image on each LCD. Is this like a picture studio? Are you trying to use these systems for tasks? I love the idea, I really can't wait to see some work done on it, There is a mod that uses two computers in one case in the mod guides and there is a mod that uses arcrylic to build a custom case as well. With these two mods, you should have a starting point. Can't wait to see it.
"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