Downgrading the Playbook from 2.1 to 2.0/Installing Google Play

Hello all,

I have recently gotten a BB Playbook and want to be able to install Android Apps on it. However the selection available on the App World is pretty small. Has anyone found a good guide for downgrading the OS to allow sideloading or how to install Google Play? I have had a look about and can't find a coherent and clear one.

Any help would be greatly appreciated.