Here is a map of Minnesota with all 87 counties made from separate pieces of wood. I've made dozens of different versions over the years. A lot of people saw one at the Minnesota State Fair in 2007 (2nd photo). That one measured 41" x 42"
There is enough room in Wisconsin to add a custom feature, like the Split Rock Lighthouse or a farm scene. Some versions have included a list of the wood used for the counties and borders. Customers can choose what color the water should be.