I looked at some of your projects and you are so neat.  I root a lot of plants and most make it until the last 2 winters came.  Lost a lot of the Hydrangeas and other cuttings I needed so badly.  I can't get them all in one cold frame like yours but Remay and tarps covering plants sitting on ground work very well here in east Tennessee.  I just did not have enough float cloth and tarps to cover the newest cuttings.  I do now and will get them neatly organized like you have yours in one of the pictures.  That was a joke....I do what I can since my plants and I live at different places.  Still many more plants I would like to grow.  Nancy