VR Lens Testing Rig

Found some lenses on amazon and decided to buy them to see if they would work to create a VR Cardboard goggles. Just a frame I modeled really quick that allows me to adjust the spacing between the eyes and the distance away from the phone to test out if its possible for me to make a pair of goggles. Pain in the butt to calibrate something like this but its something small that prints in 30 some minutes and in the end is just a throw away type of thing.

http://www.amazon.com/gp/product/B00EPQ9EVQ/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

The only issue with these lenses is that they don't come in exactly at 38mm. The 3 I got are completely different sizes ranging between 39 and 41.

Besides the issues with the size, they do work well when I watched a show on my phone for a few minutes using an app called Cinema VR. Now the next step I want to design a decent pair of goggles, something Google Cardboard-ish but perhaps with the diopter from OSVR, since their design works better