Puppet,
I hope you don't think I am criticizing what your trying to do. I just wanted to show you my perspective on things as I've been an Systems Engineer of sorts over the last 10 years and have dealt with many hosting facilities in the past.
For example, I worked for a company that made $10,000/minute in some of their applications and downtime between 6AM EST - 2AM EST cost them serious money. When your talking about a Large Scale Bitcoin mining operation, you need to account for when things go bad, not when they work well.
The reason the price I got was around $.45/kwh for about 8KW/rack is due to the fact they had superior services/multiple generators / UPS / etc AND Insurance.
Some of the bitcoin mining DC that I've spoken to in the last few months that are starting up, are not even Datacenters. There just warehouses with racks and power, let alone UPS or cooling because "its to expensive" . Those things need to be considered when you have over $100K worth of Bitcoin hardware, and what happens when the warehouse Burns Down/Floods/Extended power outage.
Thats why that company I mentioned above paid for one of the most expensive DC solutions .. Piece of mind that our outages would be limited throughout the year, protecting revenue generating services, just like Bitcoin Mining. If your hardware is down, you make no money !
Lastly, I dont have any miners myself, but from seeing the forum, I see various devices lock up and freeze randomly. You just need to make sure if thats the case, you can automate/semi-automate that procedure to reduce that downtime, and heal itself in 90% of those scenarios (overheating or software glitch)
[Edit]
Another thing I forgot to mention, is that DC in a Cube picture you posted above. I've always loved the idea of those, and think Iceland could work well with that. Ideally you could find an office Park or building that has extra land, and work out a lease for that part of land, and just get power / water to the Cube itself.
If you really wanted to take this to the next step, I'd prefer not using Colo at all. I know in the states many business's have Virtualized, making their 1000sqft+ server rooms almost 90% unutilized. You could easily approach them and ask to rent out part of their DC. If they already paid for the Generators/UPS then you could just bring in racks / bread racks and host the units there. Only thing is you would be responsible to be the "remote hands" and could be woken up at all times of the night
The benefit of this is you may get a better deal as that business isn't using that space currently, even though they spent a lot of money setting it up. Secondly, the cheaper you can get that space, the better for the bitcoin mining field. Again this would most likely only work if you wanted to make a new service out of this as a full-time job, or have someone managing the physical location.
[/Edit]
Wish you the best
kosta