Nice writeup. All of the technical detail is great!
I'm curious about the process of getting colo space. Did you use a broker? Did you negotiate, and if so, how large was the difference in price between what you initially were quoted and what you ended up paying?
We reached out to almost every colocation space in SF/some in Fremont to get quotes. There wasn't a difference between the quote price and what we ended up paying, though we did negotiate terms + one-time costs.
Please consider posting the quotes, even if you have to redact colo names.