cubie created a viewfinder for the NEX using legos and a one time use film camera. if you don't have legos, sony has the FDA-SV1 optical viewfinder for you. The FDA-SV1 can be modified to accept 3rd party viewfinders.
Thanks cubie!
I stuck the Sony NEX-5 on the Gaui quad. It maxed out the weight limit at 1070 grams. I am using the stock 16 mm f2.8 lens and a 3S 2500 mah pack. Video quality is pretty good though. My pack is not very good so internal resistance is pretty high. It is only using 1000 mah after 5 1/2 minutes.