Well you have several choices not knowing your building expertise and not seeing the kennel I'm just guessing here.
The simplist way is to get a large tarp, hardware cloth, and a cattle panel or two. These things will depend on the size of the kennel. Now what you will do is arch your cattle...
that's awesome yeah that pretty much worked for me as well, but I have fresh air chickens not free range so it was much easier to do so. in addition I use a chicken tracto to let them graze on grass on nice days.
I added to the coop and will be expanding the run, then I'm putting down grass seed around it along with straw so it will grow. But this is all recycled materials!