@SunshineAnShade , you've already done one of the best things you can do here - listened to some good advice and decided to make adjustments to your plan. Shows a total willingness to do the best you can for your babies, even if it conflicts a bit with your original thoughts. One of the pioneers in this entire thing was Miss Beekissed - she's the reason I went ahead and gave it a shot when we had an injured chick last winter, and I haven't regretted dumping the heat lamp for Mama Heating Pad one bit.
The concerns she addressed were pretty much the same ones I had - she just explained the whys and wherefores and broke it down better than I did. While Bee and I are totally on the same page about the system and believe in keeping it simple. simulating a broody hen as closely as possible, I think I tend to lean more toward the "it's your idea so give it a shot" school of thought.
She has a ton more experience with all things chicken than I do. Last year was my first year with chickens and I got more than one well-earned wake-up call from our Bee.
I just haven't been crazy about using solid structures (boxes, wood frames, etc) for this as I think you lose so much flexibility and it sort of defeats the purpose. Chicks just don't need as much intense heat as we've all been led to believe. It's much better to provide them with a corner where their bodies are warmed just when they need it, and the surrounding areas are cool. But when it comes to how to provide that, I've been wrong on this thread before, and azygous' foam set-up is a good example of that. I just couldn't visualize it, but I finally got it when I saw hers in action. It's for that reason that I try not to discourage experimentation. But I will always believe, and have said many times before, that the more we tinker the further we tend to get from the original concept - providing a soft, warm, substitute Mama Hen.
So don't be confused or discouraged, my dear. Go back to page one, look at the setup I use, and try it. Mine has the heating pad draped over the outside. Bee's has it on the inside. But our finished "caves" are the same. My heating pad was just barely above their backs, Bee likes hers to touch their backs. The truth is the chicks really don't spend that much time inside it anyway. There are so many posts on this thread where folks worried that their chicks weren't inside the cave much and they worried. But that's natural. They are supposed to spend most of their time outside the cave, exploring, getting into trouble, and growing feathers in the cooler air. They'll spend more time on top of it and around it anyway, especially when the temps outside are warmer.
You can do this!! And your chicks will simply thrive! But the key to keeping it stress free for you and for the chicks is to toss out the old school of thought, where the chicks were kept at baking temperatures until they start to lay (that was tongue-in-cheek, by the way). If they know they can scoot under Mama Heating pad when they get chilly or spooked, they'll do just fine. And for that a plain old wire frame of some kind, a heating pad, and a folded towel or pillowcase is unbeatable.
Stay with us! We'll be right here!