Looks really cool and must have been a fun project.<p>I guess it's not hugely practical, partically as each Pi has a display attached.<p>Mythic beasts in the UK are doing Pi based co-location. I think this could be interesting. Not perhaps in terms of performance, but the isolation between users in nice.<p>See here:
<a href="https://www.mythic-beasts.com/order/rpi" rel="nofollow">https://www.mythic-beasts.com/order/rpi</a>