I design and build or rather used to....
I dont want your bounty but will happily offer up my 2 pence worth.
Not a concept i would choose, cooling is more complex than that....
How many servers are we talking? what are the BTU Raiting etc.....
How will air "flow" work around the space, will each server get enough cooled air
Why not free cooling??? just high speed fans in a small space and extraction can be enough on small setups.
Its not as simple as your question makes it
I am not sure of the BTU rating, but I will need to dissipate upwards of 40,000 watts.
Air flow would be a bit tricky. I was planning on an intake and exhaust fan to get rid of humidity.
The summer here are brutally hot....can get up to 110 F. high speed fans don't really cut it in those conditions, at least they haven't the last couple years.