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I suppose that would work, but it seems like an awful lot of extra complication. Plastic goes onto a run really easily with a staplegun (into the wood framing of the run), preferably through duct tape applied to the plastic all along where you're stapling. The duct tape prevents tear-out due to wind and temperature-related shrinkage of the plastic, and it enables you to use the plastic several years in a row.
To me, the advantage of this is that it uses the same or less material (probably cheaper, b/c you're using 2x4s instead of pvc), while making a more structurally-strong run that is more guaranteed to withstand large animals bouncing off it, or standing on it, for many many years. An option to consider, anyhow.
The chicken wire, by the way, will be done so that is a continuous floor and sides and the two sides meet and are tied on the roof.
Are you *sure* you want a wire mesh floor on the run. It is not
too terrible if you can put a foot or so of earth (or roadbase, or sand, or whatever) on top of it, so the chickens can still scratch around and so that the wire doesn't catch their feet and trap poo; but that is a lot of extra work (and some expense) to go to. If you do not bury the wire floor deep -- and I would NOT use chickenwire btw -- then it will be a persistant problem in a variety of ways and I betcha you will really kick yourself for doing it
A horizontal apron of 1x1 or 2x4" wire mesh, 2-3' wide, laid on the ground all around the outside of the run and securely attached to the base of the run fence, with its outer edge turned down or pegged down well or buried under mulch or sod or whatever, will do a good job of keeping large digging things out. As far as weasels and rats, good luck keeping them out by *any* method, at least for long.
Good luck, have fun,
Pat