Update: I used the Cardboard tuner: https://www.google.com/get/cardboard/viewerprofilegenerator/
to create a profile for my particular setup. So if you're using amazon's "Ajax Scientific Polished Glass Double Lenses Spherical (Bi-convex), 38mm Diameter, 50mm Focal Length", and have an IPD of 65mm, the attached QR code should work for you too.
A VR viewer that will fit 5.5" phone screens.
Supplement this part with lens holders here:
...and phone clips here:
(Note that these aren't absolutely necessary. Rubber bands will attach any size or shape of phone to this headset nicely.)
3 X 0.5" neodymium magnets. 2 on the outside, one on the inside.
1.5" elastic for headband.
Foam Padding for head comfort.
I modified my previous viewer: http://www.thingiverse.com/thing:634518
to have button access on the outside of the viewer instead of the inside. In so doing, I also had to narrow the screen window slightly, so the fit for the Note4 is now a little less than ideal.
I also added an additional phone clip nubbin to the top of the headset, so the upper clip should now snap into place just like the bottom one.