They're sometimes called a "battery brooder." I've seen them for sale at several places.
https://www.strombergschickens.com/product/five-deck-battery-brooder
https://www.mcmurrayhatchery.com/poultry_brooder.html
https://incubatorwarehouse.com/0540-deck-game-bird-poultry-battery-brooder.html
They are not cheap, but they are very efficient in terms of how many chicks in how many square feet of floor, because of being stacked up. And with the feed and water outside, they aren't taking space away from the chicks, and are easy to tend.
Several places have something similar to what you describe. It was in the catalogs about 25 years ago when I first started looking at such things, but I don't know how many years it existed before that.
https://www.mcmurrayhatchery.com/start_and_grow_unit.html
https://www.strombergschickens.com/product/start-grow-cage-unit
https://incubatorwarehouse.com/0703-poultry-brooder-and-grow-off-pens-set.html
It's got one heated brooder on the top, and the lower two levels are taller pens with no heat. They say the top level can hold 48 chicks up to 4 weeks of age, and then the chicks can be split into the two lower pens.
I've never been quite sure if it was for raising meat birds (butcher at 8 weeks), or for starting layer chicks (move to other housing around 8 weeks.)
(Yes, some of the pages I listed have the items sold out: but the product pictures are still there to look at, and anyone who really wants to buy one can watch for it to come back in stock.)