Alternative Designs or Materials for the Back Cover?

[BMayes]

It's not an official CAD file, but there is a basic backplate you can modify to your needs on Thingiverse: https://www.thingiverse.com/thing:4548120

Thanks!  I will see if this one is available, and possibly try it out later.

There's also a fair chance I'll make a cutout in one of my spare back covers and then cover it with more plastic.  It won't be pretty, but it's an alternative.