You don't need to build your own datacenter unless your workload requires a datacenter's worth of hardware. Colocation is a feasible and popular option for handling all of the hands-on stuff you mention. Ship the racks to a colo center, they'll install them for you. Ship them replacement peripherals, and the operators will hot-swap them for you. If you need redundancy, that's just a matter of sending your hardware to multiple places instead of one. Slightly more involved, but it's hardly rocket science.