Back cover for car bridge dock

I love the original file, however, I plan on using this in my car and would like to cover the back side of my RPi Zero to protect it from shorts and damage. 

Using chrisg20's original file, I added a back cover with cutout for a heatsink block.

I did not have any 2.5mm screws on hand, so I used 3mm; but the 2.5mm screws as originally specified should still work, just use 2.5x8 mm for the additional length.  I put recessed openings for the screw heads.

No changes to the original, added additional backer block.