I'm sorry you've had such a rough time with gardening! Your local extension office can usually help a lot with overcoming the obstacles to gardening success. Not sure which of these would be better for you:
That said, flexible greenhouses have been built and used by the Garden Pool organization. Check them out for ideas:
I figure you will enjoy prowling around this site and soaking up info, but thought you might appreciate some external inputs as well!
Also, if you have any plans sketched up of your ideas, people can respond to your concepts in a more informed way.
Best of luck!
Hey, people who build glass houses in Phoenix shouldn't throw stones at Winslow ;)
If you have a cell phone with a camera, you could snap a photo of your plans to post without the fuss of scanning them in... just a thought. Happy trolling, Liz