Updated 15 Nov 2019 Version 2. Reduced diameter of male insert to 7.7mm to fit an 8mm Drill bit hole.

Drill Holes 15mm from corner edge of your panel.. Recommended no more than 9mm panel thickness. Be careful removing the panel from inserts, push down on insert to remove panel.They are now 3 perimeters so should be a bit stronger.

Work locker legs for creating multilevel raised platform in work locker.
Cut panel as per your locker size.
Insert holes are 8mm diameter,

Gcode for Ender 3 pro only.

Should scale ok along z axis if you want higher platform

No structural supports needed