I made one, thanks for sharing yours.Instead if building a floor (which the rodents will just live under) can you dig a perimeter around just the coop section and install hardware cloth down in the ground?
This is what we did for our coop with a dirt floor..
Also I recommend you build some bucket traps. You need some 5 gallon buckets, heavy wire or metal rods and small metal cans like vegetables come in. You bait with peanut butter. You could build 4 or 5 of those and they would drown rodents all night. Just empty in morning. You can use water in summer and smell free RV antifreeze in winter. There are direction to build them on the internet. Good luck!
Edit: took some pictures of one of the bucket mouse traps my husband built for me and i can gaurentee they do work.
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