Plimoth Plantation is renovating and expanding its craft center. Since 1992, the center has been one of the museum’s key exhibits, at which visitors can watch artisans working with tools like the ones used in the 1600s. The plan calls for adding a bakery so visitors can view demonstrations of 17th-century baking techniques. The space will also feature seating, updated restrooms, air conditioning, and other amenities. The $1.2 million project is expected to be completed this summer, and when Plimoth Plantation opens for the season March 15, the craft center artisans will be relocated to the visitor center while construction is under way. “We are very excited about this project,” said plantation spokeswoman Sarah Macdonald, in an e-mail. For more information, visit www.plimoth.org.