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get several large cardboard boxes, install a roosting 2x4 (or two) on top of your current brooder, and set the boxes up as a "second story loft"
you can cut a viewing window in the side of the added boxes; either use plastic (we used an old pizza box top) or wire mesh/hardware cloth
nice thing about cardboard boxes -- instead of trying to clean them out/scrape them out, you can consign the befouled ones to the compost heap, and use new ones
ours were partly paper-towel cartons from
Walmart, and heavy liquor boxes from the liquor store -- an ideal box might be from an appliance store, one intended to hold dishwasher, dryer, or even hot water tank ...
cut to the size/conformation you want with a box cutter, then tape together --- set up access panels anywhere you want
actually for part of the time, I had cardboard on the bottom, and an upside down clear plastic bin on top of the roosting boards, so I could watch what they were doing