I assembled a wireless USB tethering option, it is integrated into a battery grip and not a dongle hanging off the side.
The adapter is completely enclosed in the grip and draws power from the inserted batteries.
This prototype is connected to a Nikon D5000 and the EN-EL9a batteries power the camera and the wireless USB adapter.
Check out the complete component rundown and video of it in operation:
*Link Removed*
Thanks for your opinion!