UsedEverywhere | Start a Vegetable Garden: A Beginners' Guide for the Red Thumbed
Great tips here on how to build a walipini - or a pit greenhouse. Depending on latitude, but despite above ground air temperatures (and wind chill), 6 to 8 feet down into the earth, temperatures remain fairly constant, between 50 and 60°F.
Ana White | Build a Barn Greenhouse | Free and Easy DIY Project and Furniture Plans
YOU CAN BUILD YOUR OWN ADD-ON GREENHOUSE / It's a snap to design and build your own attractive conservatory from low-cost new and salvaged materials.
Drying rack of picture frames and screen
Rather than a chicken coop, and rather than herbs, I think I'd plant a good strong ground-cover plant atop the dog house, as a place to rest.