Congratulations. This is your best work so far, in my opinion.
Patch mesh is ok for the underground tunnels, but I can see it from above ground in certain places with r_showtris 1. That's a pretty big fps hit. (I made the same error with columns in Coyote Bluff.)
Did you try any hint brushes? Or is what I'm seeing only "natural" vis blocking?
I love the corn field with scarecrow, & the cow models are fun to shoot. I'm a big fan of steaming cow pies too.
Is it my imagination, or does this map need a bit more money lying about for deathmatch? Or perhaps you might increase the dollar amounts for the limited pickups?
I'd like to see the .map file someday if you ever wish to send it to me.
Good work. Simple, yet decorative & unique.