Chevrolet Studio still had more work to do before they would get the final approval to release the '64 Impala. This photo of the studio's "see-through" clay model was taken on April 25, 1962. Getting the go-ahead to produce a see-though model usually indicated that the design was thought to be nearly ready to release. Producing these models required the Fabrication Department to make a plaster cast of the upper part of the car from the belt line up. Fiberglass duplicates of the roof and window glass were then produced and carefully installed on the clay model. The clay sculptors would then blend the new parts onto the original clay model.