I have this metal greenhouse frame that came with my house, and I was thinking of fixing it up. Any tips/recommendations?

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:

• What sort of adhesives should I consider for outdoor metal-plastic bonding?
• Is adhesive and soft (clear) plastic even a good idea?
• Have any of you done something similar?