I started dreaming of building pyramid Greenhouse, around 2006, while working for Growingspaces, the geodesic dome greenhouse company, I even sent them my idea, kinda hoping we'd build one see what its like, Late 2008 I started building my first prototype, (Pictured is two years old now) I used scrap Polycarbonate from Dome Builds, I finely got a good doorway for the 6 footer, still needs refining and will do that on the next one, the Khufu Plus (8' diameter)
Below is The Second Cold frame I did but have since added solexx Glazing this one opens on henges for easy access
Next is the First 6' Khufu Pyramid, doorway has been made much better in the newer models
next warm day I'll see what I can do to make this one better :) and the upcoming 8' Khufu Plus
will seal better and have Solar ceiling fan, to help heat in winter and cool in summer.