And I've been there since the beginning!

It is a long thread! It took on a life of it's own as more and more people got curious and tried it or, quite frankly, tried to come in and shoot the whole idea down as unsafe or dangerous to chicks. But the thread has lasted so long because it's neither one!
I've thought about starting with a fresh one so it's not so intimidating, but so much would get lost - the successful modifications, those that were tried and that didn't work, and all those wonderful pictures.......by the time I was done weeding it all out it would be almost as big as it is now! The basics never change - a flexible frame, a heating pad that doesn't shut off automatically after two hours, and a soft covering over the heating pad secured so chicks don't get trapped. Anything after that is personal preference.
One of the most helpful bits of information came from
@Beekissed - such good information and clear photos that I've saved a link directly to that page in the thread, if you think that would be helpful.
https://www.backyardchickens.com/th...e-brooder-picture-heavy-update.956958/page-46