The Nexus aren't the biggest things Cisco does. I used to work on the CRS and those things are huge, a fully configured CRS-3 linecard chassis is 1600lbs and draws 18kW. For the first few sales, Cisco would send a team to measure the doorways, check the floor strength and power and cooling before they would ship the chassis. The really crazy stuff starts when you run multi-chassis and have 2 (or more) of those linecard chassis connected to a similar sized fabric card chassis.
I know Bell has some CRS because they came and looked around our lab here in Ottawa but I don't know how many or what config