Very nice - I see you're a fan of 8020 as well!    What material are you using for your sides?  I use acrylic but primarily just because I have a laser cutter and it's one of the easiest materials to work with:


One suggestion you might consider - I experimented a fair bit with airflow, and if I'm interpreting things right you're pushing in on the bottom of the front and pulling out on the top of the back.  I tried a similar approach, but it ended up being less efficient, and the best was actually making the push and pull parallel to eachother, and just putting vent slats above the front of the inlet fans, so hot air can't get trapped in there.  If you put the vents above the exhaust, then it tends to short-circuit - but as you can see in my latest builds, I just opted for no back panels at all and use industrial tubeaxial fans.