Thanks for sharing, fittsy.  This is looking awesome man!  Certainly is...  Please keep us updated with your project.  Always like seeing what other people come up with when using their imagination.  It's truly inspiring and can generate other ideas to those who see them.

One question:  It looks like the intake and exhaust will be right next to one another with those galvanized steel exterior wall vents.  Do you have any concern with the intake sucking heat from the exhaust as it comes out?  It may still work fine.  I was only wondering...

If it does end up becoming an issue as you add more and more rigs, you may end up having to build some kind of exterior wall that's tall enough to act as a divider between the intake and exhaust vents to reduce the heat.  But again, that's only IF it ends up becoming an issue.  That was my plan if my intake and exhaust (on the same wall) were too close together.  My intake and exhaust are 20 feet apart from one another and end up working fine without building a divider wall outside to separate them better.  it may end up working fine with no issues.

Please do not think I'm being overly critical of your design and work.  I like what you have going on there and look forward to seeing more updates in the future.  I'm simply asking legitimate questions to see if you thought about it and find out if you had a plan B if it ended up becoming an issue?