3.5" hard drive mount to a flat surface

These mounts will fasten a 3.5" hard drive to a flat surface. They are inspired by tkbletsc's hard drive brackets (https://www.thingiverse.com/thing:2352211), using the heights and sizes in his model, but created from scratch in TinkerCAD. The ledge lifts the HDD appx 6mm from the surface for cooling. The screw holes are 4mm internal diameter, and will fit standard hard drive screws.

This is the first model I have created and uploaded. I needed some hard drive mounts for an arcade machine p