Raspberry PI (OctoPI) Controlled Power Console for 3D Printer

I wanted to make a power control box similar to the one built by Jeffeb3 (https://www.thingiverse.com/thing:1428478) to control my Prusa i3 and lighting via OctoPi, however I wanted to use all 4 relays on the Sainsmart relay control board, and also wanted 2 always-on outlets. I also did not want to colocate the Raspberry PI 3B inside the power board, instead opting for repurposing a CAT5 cable to carry TTL signals from the Pi to the power control box. All of my code was based on Jeffeb3's work, please look at his Thing for completing that portion of the build (just duplicate commands for the other 2 relays.)

The power control box was designed in FreeCAD. This was my first time designing something in FreeCAD, any constructive feedback is welcome.

The Sainsmart relay board is secured to the bottom of the box with 4 M3x5 screws. The top is secured with 4 M3x10 screws. I had to use a drill to ream out the holes to get a better fit, the uploaded design incorporates changes that s