External Battery Holder for Phantom DJI

I wanted to design a Battery holder for carrying 2 Batteries without doing any change to my Phantom. The new Battery Cap is still in progress, and I will add it later. If anyone got a good Battery Cap model, please let me know :)

Jan 6th 2014
I just added my design of the battery cover with two openings for the connection. I leave it now there.

Jan 8th 2014
Added a top for the battery holder as tempeature protection. First flight in a cold surrounding showed that it is neccessary to cover the battery because they get to cold.

Feb 16th 2014
Added an extra deep cover on request.

Step Files available if you want to do changes.