Well done and the filter makes a dramatic difference to the uBitX.
I have been really impressed by mine. Another thing I found - the uBitX is very stable.
I had the filter switched to it's narrowest position and was listening to a CW station while messing about with something on the bench. The signal stayed exactly the same for around 10 to 15 minutes with no sign of frequency drift. That also proved the other guy was stable as well.