After a well deserved vacation I came back and continued with more work on my modifying my table enclosure.

I have a plan to put perspex on the front, left, and right sides.
The back I will have a wooden back that will also support the power supply.

To create the back I got some old particle board, and cut a sort of ‘T’ shape that I rotated 90 degrees and mounted it to the enclosure. The bottom of the T sticks out and that is where the power supply is attached.
I used a power supply holder I found on Thingiverse
https://www.thingiverse.com/thing:620172