Hoop coop idea for overwintering my garden boxes

[Floof]

So I was at tractor supply and I ended up walking out with 7 ducklings for $2. I need a place to put them when they outgrow the brooder and I'm thinking of making 2 "hoop coops" to go over my unsuccessful garden boxes and over wintering them there. Our soil was poor and didn't hold water and didn't have enough nutrients and everything I planted is stunted and sad. Duck poop and bedding can't hurt the situation. I would make them 10 feet long and 3 feet wide, housing 3 and 4 ducks each. I originally was thinking to make them as short as possible to make them lightweight so come spring I can move them off more easily but is it worth making them tall enough for me to get into if need be? Sick bird, turn over bedding, retrieve an errant food container? I just wanted some opinions while I kick around the idea. Factors to consider: Im pregnant and due in December with no family support besides my other kiddos so I need something inexpensive and easy. I also don't want to have to let them out and close them up every day so I'd prefer it double as their house and run.