I need to move the cover tape slot back and turn the cover tape pull distance up a bit.

The latter will change a good number of dimensions.  Hold off on printing for now.

I'll have the updated files up by Saturday.

EDIT: I took one to the local Makerspace and Sim had a mounting suggestion which I really liked.  

I'm adding a DIN rail mount to the bottom.  It was also 'sticky' after my changes.

I'm not done with it, and currently busy with the P1.  I'll get back to this when I'm ready to mount one.

EDIT 2: I had a bit of a eureka moment this evening, and I'm changing the mounting again.  I'll keep the old bolt-down one for those who don't want to go in the direction I'm heading, but I personally can't wait to try it.  

I'll give you a hint.  Lego's have 8mm pin spacing.