Something to consider would be a modular approach through the standardized shipping container. You need three connections: power, connectivity, water(technically two, in/out). You can seal these units up so you won't have to cool an entire building. A 20' container has 19' by 8' by 8' of internal volume. Internally run a water to air heat exchanger, have a small network stack and treat each container like a mini datacenter.
In the end, if you were to achieve your $1m IPO, you'll still be looking at not even filling out one of these containers. Just putting 8 42U racks in to this container and filling all that capacity with FPGAs would easily blow through $1m. For giggles, if the BFL Mini-rig were a 4U unit costing $15k consuming 1.2 kW and generating 25 GH/s, that lets you put $150k of gear in a rack with 2U available for watchdog/switch. $900k gives you 6 racks with this stack leaving $100k for the container, power distribution, networking stack and heat exchanger. That generates 1.5 TH/s, sucks down down 72 kW of juice and another 7 kW of juice for cooling(COP of 10:1).
So yeah. When talking about datacenter stuff, $1m doesn't really buy a whole lot when 1 rack of gear costs $150k. This was 5 minutes of armchair thinking and it's already sounding like you have much larger plans in your mind than what is capable.
This is why I was planning for basically 4 racks of my own in the data center, and the racks won't be packed full.
And yes, I have more plans. The plan listed is just phase 1, and it must be completed before I consider anything else in full. I don't want to waste money by buying too small, and who the hell is going to build a tiny hut in the middle of nowhere with a single rack in it.
I don't need all $1m to start building the DC, I just need enough to keep it from financially collapsing. Depending on how BTC prices continue, we could be looking at building the solar farm first THEN the DC, I consider this an acceptable outcome.
I have been considering effectively building a container storage facility, however it just doesn't seem to be worth it yet, not enough hardware. Its easier to build, say, four walls of rebar reinforced concrete with extra sound proofing measures and fill it with a bunch of locked security racks and just renting out the excess space.
What I think is interesting about containers is, literally, people could just ship them in already loaded and I just have to park them in the facility. Small customers wouldn't, but the Amazons and Netflixes and whatnot would easily consider it. Although, at that point, I'd probably have to pull my corner of the Internet to me and thats pretty expensive.
Containers make it a lot easier to do airflow containment, but it requires a lot of custom tooling. For what we need now, its just too much. However, a bunch of racks doing hot aisle/cold aisle with cold aisle containment and high airflow in the hot aisle would do just as well.
Several manufacturers have complete containment rack solutions that prevent hot air circulation in the rack and forces it out into the hot aisle, so for now, I think this is what I'm going to pursue.
Edit: Actually, I wanna ask our resident experts on something. Is there a complete solution to do both ducted hot air and cold aisle containment that is worth looking at? I know they exist and a lot of the high density DCs are starting to use them.