Lakecountychick, your coop sounds very similar to mine except that mine is less than a foot off the ground. I was planning on placing cardboard underneath it to catch the droppings. I like the scrub brush suggestion for the wire, and I'm glad to hear that it is easy to clean.
I think I will leave the areas under the roosts bare and put straw on the rest-though I do like that rubber mat idea if I can find one.