I have built two hoop houses like that but they won't survive a low megaton blast like yours we raise broilers in them. No wheels on ours we can drag by hand or use a quad. I think your gonna need something bigger. Take a small box and cut a hole in two ends the chicks will gather there at night and keep each other warm at night. You can feed chickens table scraps if you like they eat just about anything you toss in the pen. If you are going to keep them on there you will need some nesting boxes to lay their eggs in. That's the best part fresh eggs. Have never had an issue with critters getting into the hoop house. Once they get bigger you will want to put a roosting pole in there as well. You will be able to let them out during the day with the door open and you will find them in there at dusk. Close the door and there good till the am. Have fun and enjoy. Nice job on that hoop tank btw