Hello I leave this place two receivers support Senhheiser EW G2 and G3 in our Sony NEX-EA50
If in addition you lay amid a battery act as a counterweight and help balance the camera. A clip and a thick paste is sufficient to hold the battery.
The model for 3d printing and leave it in stl format gcode, that when using the STL will have to put a support protrusion that fits into the camera.
discharge https://mega.co.nz/#!kM40laZY!wOJHKOyFBThrtSME5ROxwK66qnnDWCai9kE1Gsi5jpA

I hope you find it useful.
Greetings...