At that age chicks need food, water, protection from predators and protection from weather. Roosts and nests can wait. At that age in Pennsylvania they can handle your coldest weather you'll see after that kennel arrives next week.
My suggestion is that when that kennel arrives put an apron around it to stop digging predators from digging in and chickens from digging out. Take a strip or wire maybe 12" to 18" wide and attach that to the bottom of the kennel right at ground level. Hog rings work great for that or you can thread wire. Make the attachment such that nothing can squeeze through the opening. Put it on the outside of the run and overlap the corners. You don't need to bury it if you put something on it to hold it down but taking up the sod and putting it on top gets it out of the way of lawn mowers and weed eaters.
How tall is the kennel? I'd put a top on it to stop climbing predators (wire will work) but it needs to be high enough you can walk comfortably under it. That should take care of basic predator protection.
The food needs to be kept dry. At that age the only weather protection you are worried about is rain. I don't know how many chicks you have so I don't know how big it has to be but you need something that can keep food dry and keep the chicks dry. That can be two different things. The floor should be raised a bit in case it floods. Rain can blow in from the side so it needs a roof and at least three sides. That will also give them a way to get out of a strong wind.
You can make that as simple or as complex as you wish. You can make that as expensive or inexpensive (within limits) as you wish. Some of that depends on your imagination. You can probably buy something simple that works like a large plastic bin. I'd probably build something out of 2x2's and plywood. You could cover it with plastic instead if plywood if you wish. If it were me I'd put a door on it with ventilation holes up high so it lets light in so I could safely lock them up at night and I'd build it solid enough I could isolate a sick or injured chicken in it, use it to house chicks for future integration , or maybe a place to isolate a broody hen if I wished. But for your immediate purposes they just need to be able to get out of the weather.