I designed this but soon after I finished the design I decided to switch to a laptop power supply so it is not tested. If anyone wants me to make it a little slimmer on the one side so it can be mounted on the back with the wires facing down just ask.
IMPORTANT: If you are using blind joints on your Rook 2020 then you have to use the shorter version if you are mounting it vertical. If you are using the corner bracket then you are fine and can use the longer one for horizontal and vertical mounting.
The author remixed this model.
I changed the model a lot to connect straight across instead of being an L shape.