I loved the idea of a greenhouse. But would not tackle this again. We are an older couple and needed help to put it up. The first weekend we had 10 people working on the greenhouse. Two guys were working on prepping the area and the others were working on putting the frame together (two were metal workers by trade). By the end of the day the frame was put in place. We are now talking 8 weeks later. Our son and grandson spend one day of their weekend working on putting the greenhouse together. It's been a slow process. If someone's put this together in a weekend, they sure are much better then we are. The directions are a little hard to follow. You Tube has been a big help----without the tutorials I don't know where we'd be. our son has spent hours watching how to put each step together. We still have a lot to do. I'd have thought that if you ordered ventilation windows, the panel for that area would have been prep for installation. All I can say is I hope its worth the effort, because our family sure isn't happy with us and our purchase. I gave it a 4 because I think when done it will extend our growing season by a lot. I'd give this greenhouse a 1 or 2 on ease of putting it together.