Update 3 (2/17/19): I found that the PSU clip was just a little too snug, so I added 1.5mm of space between the clip and the bracket.
Another update (12/26/18): I've mirrored the lower PSU mount as it needed to be installed inside the leg rather than outside. The bracket with the integrated hanger works well but requires some supports when printing.
EDIT: New integrated PSU mount paver brace bracket added based on user comments. NOT YET TESTED! Note you will need to use a slightly modified version of cisardom's lower PSU mounting bracket (from the original enclosure design) which I have included in this remix.
This thing is designed to add support to the underside of a standard 'Prusa enclosure size' lack tabletop so that the top of the tabletop where the printer sits can be (mostly) removed and a concrete paver stone can be dropped down into the lack table. This ensures maximum head space in the standard size enclosure while also gaining the benefits of a paver stone which are improved (reduced) printing noise and added enclosure robustness (much less prone to vibration). I am working on some additional things that will allow for a clean removal of the underside of the upper tabletop so that the MMU2 will fit in an otherwise standard Prusa lack enclosure.
I'm using the following thing to relocate my PSU for conformance with these brackets:
Doesnt matter Doesnt matter
2 perimeters should suffice if using a 0.6mm nozzle, as I did.