It's a prototype, so hard to remove the mount, and it looks disqusting, but works well.
You need a PS3 compatible controller. I bought it for $12,34
A bicycle spoke $ 0,2
and a used back cover.$ 2-3
I've used a tape to fix the back cover to the spoke, but if I make a better one I'm going to solder a platen on it.
Other mounts witch inspired me:
PS3 Controller: My phone mount mod
My simple Ps3 mount
Homemade PS3 Joypad phone mount for Nexus 4 - Pretty cool!!
SIxaxis Controller DIY Mount
LOL: Custom made Xbox controller mount
Other pics click here