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I would space the roost to where it is no closer to a wall than 12". Then do a 24" wide poop plank of OSB with linoleum glued over that. Sheet metal would be even better. Scrape and remove poop daily
to avoid fume/humidity buildup and lung troubles. Do not worry about removal but make it removable anyway. After scraping, residue of streaks will quickly dry
and not stink up the coop.
Definitely do a linoleum floor because odors and such cannot penetrate and grow bacteria. Caulk it at bottom using Sonneborne NP1 caulk. Regarding a skirt around edge, I think it is good and really nice for when changing litter to be able to turn a hose on it all for dust and disinfecting too. I have no inside walls, and no insulation either. So I just ran a bunch of scraps up the sides of the coop about 16" or so and stapled them in to studs and to osb sheathing. They each taper outwards to where they cover the 2 x 4 baseplate of the wall. I then caulked each one so as to be able to spray it with a hose when cleaning it. Best thing ever for cleaning. No places for creepy-crawlies and whatever to breed either.
With the poop plank, you will find that litter should last a year unless you have breeds that stay indoors a lot in rainy or cold weather. Get breeds that do well in wintertime and they are likely to be all-weather chooks. Mine are. I have black aussies, RIR, buff orps, and buff comets. They do not care if it is rain, sleet, snow, cold, or whatever. And I get 20-22 eggs a day from my flock of 24 (with one runt that does not lay eggs) at 7 mo age too, with no artificial light or heat, just 10 hrs of good daylight.
Work safe, ask questions, take long breaks, take short puffs and have fun.