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Probably not relevant in your location, but I used polycarbonate sheeting for my 2.4mx2.4m RO roof. Very lightweight and the ribbed (like galvanised sheet) version is quite strong, although I think you'd need a lot more support under it if you have decent snow loads in OK.
It's main other advantage is that it's smokey coloured translucent, giving good daytime lighting in the obs.
But all things equal, I don't think you could beat the SkyPod approach ;p
Good luck and start buying some nice bling for the wife.
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