Hi, I have never had one but an old mate had similar avon and that had a screen at the rear of the canopy which projected upwards, the canopy itself was as yours, relatively flat. You would probably be able to paint it, or depending on how it was attached remove it or give it a good clean and glue a piece on top of it. Fairly sure it will be hypalon rather than pvc so whichever route you take make sure you get compatible materials. Good luck.
__________________
|