More to explore:
attached lean-to shed made out of cattle panels - use as storage or extra greenhouse...or chicken house!
Make Your Own Greenhouse, DIY Greenhouse from PVC and cattle panel
DIY Small Greenhouse
*Greenhouse Boxes...from old windows & wood.
Great photo guide to making your own mini greenhouse using cattle panels. This could be made for $...
Solar Double Cropping - Making a cold frame using a partial-shade solar panel - Mother Earth News Fair