Very nice!
How many power ned the fans? it is not better to use one or two bigger fans?
36 DC fans @ 25W each = 900W
so less then an amp
36 fans @ 72 CFM ~ 2600 CFM
It's hard to move that much air with that much power.
Also, with 1 or 2 fans I lose the redundancy and add a single point of failure
I paid ~ $1.50 per fan, so if one fails it's easy to replace.