I have been using a fiberglass panel for my rabbit cage roof. It has lasted over 20 years.
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Do you have a pic of it straight on? I can't really make out the details of what you've done from this angle.
I picked up some damaged wooden crates from Home Depot (50 % off) and did some minor alterations. Then I added some dish pans (Wal-Mart) to them for easy cleaning. My plan is to add some plywood to the back of them for added support and a point of attachment to the inside of the coop.
we have the same crates but no dishpans,just straw. good idea tho