We just got our new Mother Earth News magazine today. On the front cover is a picture of a DIY hoophouse. I don't know if they will post the article on their website, but they might in a few days. You could "browse" it at a news stand, and decide if you want to purchase the edition. Look on page 42. It has several ideas that you may or may not know about now. The greenhouse would be affordable, and you could adapt it to what fits your needs best.