How much space and power do you get access into the ISP locations you are in? Are we talking single 4u and 8a? Or full racks, I suppose the answer is always, "it depends." What does the hardware side of CF look like? You must be toying with custom silicon.
It always baffled me that regional ISPs weren't selling that last mile bandwidth to customers for real dollars. Even over DSL lines in the late 90s one could have run an amazing VoD service.