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You mean like 3 ply polycarbonate? That's what I just recently did. It's actually noisier than the corrugated plastic that was on there before (although more secure and warmer which was the main aim.
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Yep that was what I mean though 5 ply might be better, the pitch is pretty low too in that location you at not going to get a lot of driving rain so it will be coming straight down if the roof had a better angle then it would make less noise. Also you could pad out the supports with old inner tube so the polycarbonate does not resonate so much. Lastly check the gutters if they are leaking or over flowing that makes a right noise. As I said uPVC doors are just cheap rubbish plus if you take the existing door out you will have to make good around it