Thanks Rich for making sick frames. I made a Hero 7 case that protects the camera a bit, fits right in to the Hyperlow mounts. With and without GPS, and with ND filter cap. I printed in Sainsmart TPU at .2mm layer height, 30% infill.
Note that there is a small slot for shielding material under the GPS mount. I haven't tested this, nor do I know if GoPro wifi/BT actually interferes with GPS, but you can put some aluminum foil/small piece of copper/whatever in there.