Give me a call and I can answer your questions in depth. I have made a replica of this instruement and I have the original blueprints for the first repro from the design engineer who made them. In addition, I spent a full day with the painting and the desing engineer re-drawing the those blueprints as the first set were actually based only partially on the pinting and the rest on an extant banjo that was incorrect to the painting banjo. If my banjo was not used in the Peabody presentation then I can shed some light on the errors found in the blueprint used for that instrument.
Long story short, it is a Boucher with a neck modified (in paint) to satisfy the violin designer/ artist. It is a double head Boucher with a medium scale neck and a peg head that had to be shortened due to the position of the banjo on the canvas. The tuning pegs are the same as Mount used on his "cradle of harmony" violins. The neck will be a three piece affair with the dowell sandwitched in between the neck layers of 4/4 curly maple. The body will be a very deep grreen/black oil paint with a tack head on the reverse side. The ribbon is clealy visible under the tacks and should be glues down to give the bottom head additional strength. The nut is of ivory (I have some if you need any) and the tail price appears to have been painted but I do not this inlayed. You can see photos of the dowel stick design at www.banjodatabase.org.
If you want more, just give me a call on my cell 301-676-1864. I am out of the office this week but will be glad to help.