The one I made is different from the style listed there but the chicks seem to be loving it all the same.Thank you so much for the link. I want to make one now.
I simply bent some HC into shape then strapped a heating pad with a cover onto the under side using a couple small bungie cords folding the extra cover up over the sharper edges to keep the babies from hurting themselves.
Plugged it in, turned it on high and introduced the chickies. Haven't heard a single peep while they're under but I see them darting out to get food and water then darting back under to warm up. A couple occasionally decide to chill on top for a bit before heading back under.
I feel much safer about leaving the house than I ever did when I had the red heat bulbs. Plus not having a light on 24/7 means they'll adjust to normal day and night cycles.
As of yet I'm not seeing any drawbacks to using the MHP but this is my first time with one.