This was a test to get a feel of the measurements and if I needed to change anything. I like how this came out, my plan is to make a laser cut version of this out of acrylic then tap the holes. Im thinking about adding a small cable tray above and below for holding power cables.
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Right now this holds 9 rack ESR units. I put the power in the middle so it would be easy to get power to where its needed. The only downside is that 1 unit wont be powered by 5V. This is where you might have an ardunio or something connected to a PI for power.