I have been to MIOBI several times. I was a member of their club for a year or two. They only have a couple of events a year that are open to the public. Some fun trails down there though.Looks nice. There is a 4x4 park on the way to our lakehouse on HWY 5. Not sure what part you are in, but it is just north of Albia on HWY5. If I remember right it is called make it or break it. I think they have a website too.
Good Work on your build. cant wait to see the finished product.