Can I have your opinion on:?
Wear a helmet, you need it for safety anyways. Wear a medical mask (like the one they use in hospitals). It will protect insects from getting in your nose and mouth as well as protect you from smog if you are riding on the street. I am not sure what you can do about the ears but hopefully the helmet will help a little. I wear glasses so I would recommend sports glasses if possible.
may I suggest that you forget the PVC and go to iron pipe it will be stable and less sway and distortion and you can be assured of a very strong mast PVC pipe is never threaded and those parts that do have threads are street pipe type fittings
