I have been told by a larger rancher that he had much more fur chewing on wire bottom cages, so he switched everyone to solid bottoms and it stopped. I've also been told that wire bottom cages can contribute to kit mortality due to drafts.
I also think they are nasty. You can't keep them clean. They constantly have a build up of urine on them, which in a cracked chin's foot will lead to infection and bumblefoot. I also think they are darned uncomfortable, especially to give birth on.
I would absolutely not use 1/2 x 1 inch if you plan to use them for your breeding cages. A kit's foot will slip through that in no time at all.