As you can see it used to have some plastic covering. The frame is held together with (sorta brittle) plastic pins but my main focus is how I’d re-cover the frame in plastic:
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What sort of adhesives should I consider for outdoor metal-plastic bonding?
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Is adhesive and soft (clear) plastic even a good idea?
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Have any of you done something similar?
Finding an exact fit might be difficult, but if you find something that’s only a little bit too big/wrong shaped you can use binder clips to secure the excess and keep it tight.