These were the first I ever owned. Got them from Tractor Supply. Great and huge egg production for two years. Spotty on the third. Unfortunately all three that I had were lost to predation in their third year.
I hadn't given any thought to critters under the coop until recently. I'm not sure at this point. I'll have to think about it. I've got 6 buff orpingtons and 6 new Hampshire reds coming in about 2 weeks, so time is short.
Won't hurt to have more insects. That just adds protein to their diet. I've never seen my girls turn down a bug. I've actually watched them "fight" over them. Snails are fun. It takes a while to get through the shell.
Scour craigslist for free pallets. It's a good source for cheap lumber. They require more work, but that's the trade off. I just ordered hardware cloth from www.zorotools.com. Delivered it was a bit more that 1/2 the price of Lowes.
I've hung a cabbage in my run in the past to give the girls something to do. If you hang it from a rope or chain or something, when they peck at it. the cabbage will swing and they have to chase it. Of course, that might be more fun for me.
Rodzilla, what is the roofing material? It looks like stone. The run looks very muddy. Are you going to put pine shavings or stay or something in there?