Looks like a nice clean build so far MasterAlex.
Its always easier to sand if the glue is under the sheeting instead of being on top of it.

There have always been reports that the Hog Bipe tended to nose over, but I have not had any issues with that and I fly at a grass field.
The rudder and elevator are very powerful as designed, it is easy to give it to much rudder and climb right out of a knife-edge. Not sure what kind of flying would need a larger rudder or elevator.