I am glad you found the tile crates, they work GREAT, that's what I used for my first coop. They are stoutly built and work great as a framework for starting your coop. My coop took me about 4 hours to slap together, nothing fancy, and the girls spent their first night in it. I had just bought five chickens that day...was very funny b/c I was finishing the coop right at dusk and the birds started flying up in the shrubs looking for a place to roost. Got done a few minutes later and had to catch them outa the shrubs to put them in the coop.
Anyway, I used two sawhorses to put the crate on, screwed boards in the bottom to make the floor solid, wrapped and screwed chicken wire around it, and just rested a plywood 1/2 sheet I had laying around on top for the roof. I have since tarped over two sides and the roof for wind and rain protection.  I also cut a hole and put together a very crude pop door that slides up and down. Cost less than $15 and has worked very well for the last five months. I think you posted that you had two crates, you can easily make a larger coop by joining two of them together.
Are your crates solid walled out of plywood or with gaps between boards like a pallet?