Here you go:
There are lots of ways to do it, this links gives instructions and tips for building one:
Here is a great video tutorial for you: https://www.youtube.com/watch?v=M9OIw5PLvck
Hi! maybe this will help!
Design a greenhouse to utilize the frames you have and then, make a frame for the greenhouse and fix using screws the windows to the frame. Best wishes.
Here's how one Hometalker made hers
I've seen lots these, yes. Use the search bar at the top left and you'll surely come upon ideas. If there's nothing here on Hometalk, an internet search will turn up loads of options.
Hello GB, here's a pretty simple green house idea for you to consider, hope it helps you out!
Lots of ideas here