Selection of Roof Casting Formwork Systems for the Bird Island Project: Case Study. The paper illustrates the complexities involved in the selection and deployment of a formwork system through a study of the concrete formwork selection on the Bird Island Flats Tunnel project. This $290 million project was a part of the Central Artery/Tunnel project in Boston, Massachusetts. Because the conventional shoring methods could not produce the output needed to meet the project schedule and budget, the contractor solicited proposals from formwork manufacturers and chose the system from CONESCO Industries.