I hope this post doesn't violate Ellis' rules. If it does, Ellis, please delete it.
Barry, There is a guy over on WoodNet that has posted a five-part series on building a solar kiln in his back yard. He did a nice job. You might want to check it out. Sounds like what you're looking for.
Here's a link to his last post. If you go to WoodNet's "Woodworking" board and scroll down, you can find the rest of his posts from the beginning.