There is a garage kit dealer that sets up at the Chiller show in New Jersey that has several Beatles kits. They are slightly smaller than 1/6th, but the heads are a little large for the bodies. They should work on a 1/6th scale body. Each kit comes with an era specific instrument. The heads are recognizable and the instruments are well made. A kit would probably cost less than commissioning a sculpt from scratch. Last time I saw their display at a show they had all four of the Beatles in Sullivan era suits, John and Paul from a later era, and Ringo from Sgt. Pepper. Bucwheats model site should lead those interested in the right direction.