I have seen a lot of greenhouses and many of them I liked but this one is a little different in that it is much shorter than others. It almost looks like a cold frame rather than a greenhouse.

There are only basic instructions here but I think most could build it as a cold frame at the very least. It would make a gorgeous cold frame to extend and start early on the growing season. Ecofriend shares this one.

If you would rather build a greenhouse that heats your home in the winter; and heats your water; that grows five times more food per sq. ft. than a hoop house; that provides food for you and your family all year long; where your food grows in 3 dimensions; where you never have to use fertilizer; where you never have to use pesticide, and where you can grow exotic foods (i.e. citrus or coffee trees in New England); that allows you to start seedlings in the spring; that hides your solar electric system; and that can house your small animals or incubate chickens and ducks.

All disguised to look like a porch on your home check out the book Secret Greenhouse of Survival. I would say that this one is the greenhouse for all preppers and survivalists. Amazing diy project.

http://www.ecofriend.com/build-greenhouse.html