Is there a reason you need the kennel than say straight up use a large cardboard box? I use two cooling racks hinged via zip ties as a makeshift access door. I’ve never had issue with boxes holding their structure, and it’s really easy to get one any size you want from supermarkets. Unless your kennel has multiple access doors, It might end up being too deep. Quails are inherently skittish, and it’s no fun having to crawl into the kennel to pick up a bird. I actually prefer a rabbit/small animal cage that opens on the long side. I have a couple of those too, the only reason I don’t brood in those is the lack of a taller wall to contain dust-bathing aftermath, lol.
Oh, and how many quails are you looking to brood?