I have all the woodworking skills of a slug and have managed to do this so it ain't difficult.
You need mesh which is available on t'internet or cheapish from your Th***** agent. (Advantage here is it's the right size for my nationals.)
Cut the right sized hole in your floor. ( I used a jigsaw.)
Then drawing pin the mesh on.
Easy to take off to clean.
If I can, you can.
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