If you use the back plate as a template for some rigid screening/ hardware cloth, you should be able to fix it through the same lugs the back plate does, so it will be as easily removable and cleanable.Once we're back in warm weather, I'd like to add some screening to either the door opening (probably simpler) or the back of the Nestera, but I can't figure how to attach it.
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They were only just settling down when I left tonight, 40 minutes after sunset.