I think the reason he used an lcd instead of the crt is because the crt was broken. Therefore, he used a lcd because he couldn't get a crt. There shouldn't be a problem with using the stock crt in the unit so long as you have space for everything else.

As I understand it, it is a vga connector that connects to the logic board. Exactly how it will fit I am unsure. Maybe someone else will know.

Also, while doing this mod, don't forget to take plenty of pics and make a mod guide for everyone.
"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