Folks, I now have my greenhouse in place, and my peppers, eggplants and even tomatoes overwintered beautifully. The entire structure is built from 100+ year old materials from dumpsters, basements, and sidewalks in our neighborhood in Atlanta, Georgia. Thanks to everyone who gave me tips, particularly the one who told me that I should build the largest greenhouse possible, since anything else would be too small very soon. They were right!
I have put together a slide show showing the construction process, and the final greenhouse. You can toggle the slideshow in the upper right to go quickly through all pics. Here it is - enjoy.
https://www.flickr.com/photos/97483618@N00/sets/72157678864561533