I sold the SS a few weeks later. I loved them but realized I really wanted to get into breeding fancy silkies. I have 14 silkies. They are a bantam breed but with all their feathers they sure look bigger than they are. My guess is they are around half the size of the ones yours will be...
This is what speckled sussex look like at 2 weeks. This brooder is 24"x36" so a tad smaller than your bin. There were 3 of them and a two-day old silkie. So you'd have 6 about this size. Just for perspective. Sounds like you've got it covered though!
This looks marvelous for them. :love
You didn't mention what breed your chicks are. I'm sort of thinking at around 6 weeks or so, this will get kind of small for them, but at 5-6 weeks you can probably remove the heat plate if they are where it doesn't get too cold, and put in a couple of...