I took the gCore demo enclosure and expanded it to hold an 18650 battery and the gCore POTS shield.  My partner took one look at my freshly printed prototype - that I was proud of - and sniffed "it sure is boxy".  I guess that's the outcome of only knowing OpenSCAD as a 3D design program.  The loved-one-of-my-life's opinion not withstanding, I'll put the design and STL files in the repo when I create it in case anyone is interested.  Maybe someone else will create some awesome 3D printed design.

It can be assembled with some M3 x 0.5 screws and standoffs (better instructions will be in the repo).