Work is progressing at the Maasdam Barns, but the historical site isn?t ready to open for visitors just yet.According to Larry Nash, chairman of the Maasdam Barns Historic Preservation Committee, a Schaus-Vorhies Contracting Inc. crew is currently working on the roof of the milking barn to restore it to its original state.That work, Nash, continued, includes building and installing a cupola on the roof, as well as