This is a remix of @hudja's SKR 1.3 Case. I liked how clean his design was but I also really liked the rear mount that Teaching Tech used in his electronics box. I essentially just mirrored @hudja's original case and rearranged things so it would work in the back. This does not support the Ender 3 Pro.
To mount it to the back, you can switch around the 4040 that used to hold the original electronics box so that the threaded holes are oriented toward the back or you can just tap the rear holes as well. Be careful to make sure the frame is squared still or it may wobble.