outside mould | holding board (according to the description in the RFD)
This is a handmade plywood "outside mold" used in the manufacture of a viola. The mold is carved out one 1 1/2" piece of wood. It is rectangular in shape but has the shape of the body of a viola carved into one side. Seventeen holes are drilled around the outer edges of the carved-out center. Three more holes are drilled in a line along one edge of the piece of the wood.