I also don't understand why cable techs, if it's a cutover. A cutover means your up and working. All of this will be rack-mounted, so xjswx idea of getting the switch and Vmail working is correct. M3904s don't need any desis, just program switch in advance. Reuse line cords, it will save allot of time and grief.
End-user training is critical. Usually set it up in the conf. room, working off the working CS1000/Call Pilot. You can do it in waves. The Call Center training is the most important.
I say 4 Nortel techs, should deliver on Monday and sit down with you and discuss the big picture. Tues. and Wend. they install. Training on Thurs. and Fri. Cut after hours, Friday night. In service with 2 guys on Monday.
You get promotion.
Adversity is Opportunity