PS3 Controller for LG L90 (66mm x 9.7 mm)
Just remixed this to work for my phone. Thanks for the good template :) I also have this out on TInkercad and you can use it to design your own. Use the bottom block to set your dimensions then throw it in the holder to see how it will fit/adjust.
https://www.tinkercad.com/things/79C8vSiPvNY-ps3-controller-customizable-lg-l90
I have been using this with emulators and also moonlight to play games from my pc (Diablo 3). I used elastic band (rubber band works too) to be a strong grip support so it doesn't wobble and doesn't slide out (I don't want it too tight and scratch phone).