Updated version - http://www.thingiverse.com/thing:245779
A means of mounting the power supply to the frame. It's a bit neater than zip-ties.
The little tab locks the hoops into the vertical slotted posts. The posts twist into the beam's slot and stop in the vertical position. The power supply keeps the post in place. There are extra locking tabs in the STL file. They're little so I thought there might be issues with them printing properly.
I have it mounted outside for the photo, but it should be installed inside the frame.