How many quail do you have? We have 27 total & if we don't move the run/coop around every 3 days, the grass dies. In the Fall & Spring we have a little more wiggle room, in the Summer & Winter it's super hard on the grass. I think our set up is 12 feet long & 6 feet wide.
We got lazy during a really cold/snowy stretch & just threw pine chips down. Worked great as far as them not sitting in their poop but attracted mice (jerks tunneled in thanks to moles) & was harder on the grass.
On the flip side of that, the grass is crazy green where we were good about moving it like every other day.
Between moving them frequently & giving them sand to dust bathe in, ours don't scratch up the grass at all. But the poop can & will kill the grass if it's in the same place too long. Also, we have chickens too & I can promise - in general - quail don't scratch like chickens do. Our 11 chickens are waaaaaaaay more destructive than our 27 quail.
I can get more pictures now that there's not snow on the ground to show you the skirt Hubby made. For predator protection we:
-The entire thing (roof, sides, skirt) is hardwire cloth (1/4 inch) so that nothing can sneak through or get a hand through (in VA we literally have every predator: bears, hawks, snakes, you name it)
-Put side panels up so hungry critters can't see them
-Put hardwire cloth (1/4 inch) skirt all around it (2 feet wide) to prevent predators digging under the sides (neighbor's dogs & coyotes)
-The door has 3 locks (one at the top, one in the middle, & one at the bottom) because I read that racoons can open locks
-On the inside we have a radio going so that there's a noise deterrent to predators (the quail seem to like certain kinds of music too)
-We have motion lights on the outside
For quail comfort/safety we:
-1/2 the roof has solid roofing on so that they have shade in the Summer, 1/2 has a tarp in the Winter to keep the snow off of them
-We have netting up in case they spook, it slows them before they hit the roof (6 feet high roof, 4-5 foot high netting)
-4 different feeders to prevent fighting
-Heated waterer in the Winter
-Heating plate (the weird flat black thing) in the Winter
-2 dust baths
-Grit
-Oyster shell
-2 different coops & tons of guinea pig houses
Mind you, to move this thing, it's a huge process. & due to the net, you are bent at the waist for far longer than your back will care for. We have to take all of their stuff out of the run, take the skirts off the run, then catch the quail & lock them in the yellow coop, then put the wheels on the run, then move the run 5 feet, go inside the run & pick up the coop/move it to the far end, exit the run & continue moving it, go back in & put the coop exactly where we want it, then exit the run & take the wheels off, then check for daylight in places where the sides meet the ground because they can & will squeeze out, plug the gaps if there are any, then put their stuff back, then let them out while throwing mealworms everywhere, then put the skirt back on.
Overall (for us), it's worth it. It's a good workout for us & the quail are super happy. They do the butt wiggle hops & happy coo every time they get moved to new grass.