The dugouts are mounting on the same cardboard/ foam base that the pitch is built on. The locations of the walls were first marked off on the base to make sure that the dugout would be centered.
The walls were cut out of 3/4" Styrofoam to the desired lengths using a hot foam cutter. They were then glued into place and then pinned together and to the base with toothpicks.
Once the glue was dry wall filler was used to cover the Styrofoam walls. A brush was stippled into the filler to create some texture. Once the wall filler was dry it was sanded down to remove any pointy edges that may have formed.