Even though we took the patterns to the foundry "loose", and they were returned that way, there is evidence that they may have been mounted on boards. There was a $50 "one time set up fee" for each of the four patterns. Some foundries charge extra for core work.
When I sent "loose" patterns to Active Brass in Perkasie, PA. for Project 113, they mounted them on boards with all the gates, risers, etc. They were returned that way so that for the next trip, they were ready to go. Of course there was a charge for this.
Bernie