So I discovered the hard way that the racks are not standard width, when I was unable to place a new IO chassis into the racks with rails attached. The IO chassis is narrow enough to fit through without the rails however.
I've talked to Steve and we decided on having some shelves made. I've asked Steve to get us 6. 1 for each end (2), 1 for SUS, 1 for LSC, 1 for IO, and 1 extra.