EDIT: I was tired of snapping arms, I transplanted this build into a MORE Massive Droner Frame build.
This 3" build is my first. I fried a few things in the process but I have an OK finished product. The prop clearance is extremely tight, I believe this leads to a little prop wash that I will never be able to tune out but its not too bad.

I fried two Unify Nanos doing the exact same thing both times. It would not boot up properly with an orange flashing light, I later found out that it was somehow getting into pit mode. I would test the voltage with a multimeter and the pads were so tight that I shorted it. I'm very happy with the AKK 20x20 Ultimate.

Another mishap was the original camera OSD control board didnt seem to work, which meant I couldnt get rid of the cam OSD. RDQ refunded me, I bought the new V3 and it worked perfectly.

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