Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4799503.
I wanted to locate a LRS-350-24 under the center of the Anycubic Mega Zero while adding a heated bed, but couldn't find any mounting options which were intended for this. Fortunately, https://www.thingiverse.com/thing:4341934 already existed for the Ender-3 and with some mild adaptation seems to be up to the task pretty well.
UPDATE: The model has been edited to include a slotted screw hole on the power terminal cover end, this should make things easier to assemble since you can start the screws into their holes before collapsing and inserting the whole assembly up into the bottom of your printer frame as a unit now.
FreeCAD projects are included if anyone else would like to make changes. The front piece was done in two projects as a workaround when needing to export and reimport as a mesh to avoid crashing bugs, or maybe just a general lack of knowledge with what I'm doing in FreeCAD so far