Are the BOs you're getting full grown and have they lived together for a while already? If yes to both questions, here's what I'd do: Attach the two exercise pens together to make one large outdoor run. Cover this with a tarp and attach to the x-pens with clothes pins. Put your food and water in the large outdoor pen. For their inside area, that dog kennel will be OK for now until you can do something better. Lay a 2x4 board on the bottom of the kennel so they can hop up onto that if they want to get off the floor, even just a couple of inches. Be sure to lay the board flat and not on its side so the girls can cover their feet with their tummy and it will keep them warmer at night. You could use pine shavings in the bottom of the kennel instead of hay. Better to compost. You can use the shavings in the laying box, too.
I'm drooling for your shed. So cute!
Wish you were closer to me...I just gave away a coop on CL last week to a newbie!
Carol