I realise this doesn't help you in the short term but I bought a 12' X 12' greenhouse with a similar build to this around 10 years ago. Over the next two growing seasons I found the cover deteriorated with the small squares of clear plastic falling out. As well as that the zips had got very troublesome before they broke altogether. The following season I built simple wooden ends with removable wooden panels for lots of ventilation, covered the metal frame with some hot spot tape and covered it with good quality tunnel plastic which i trenched in along the sides and used strips of wood to secure the plastic at the ends. It's survived a good few violent Atlantic storms over the years and I'm still growing in it to this day!
Best of luck with it and happy growing!
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