Congrats on the install.

One note of caution is some of the newer IBM & Sun equipment is coming in at 39"+ of depth. Some equipment cabinets are 42" deep and have the ability to have another 6" or 9" extender to that to allow for the deeper equipment to reside.

Check with the AHJ for their specific requirements - most are very accommodating and would rather work with you ahead of an install versus the aftermath.

KCDD