Brock, the two books I have -and I think the only books ever published on the Willow don't show a scarf ring for the rear cockpit, only a blind flying hood. The best book on the type in my opinion is the Arawasi eagle eye series no. 2, with scale drawings of the aircraft and details and drawings and photos of the cockpit as well as many period photos and a walkaround of the only extant airframe in Indonesia. The text is all English. The other is the no. 44 in the "famous airplanes of the world series" by Burindo Co. Limited, also from Japan. This is I think a more of a general history book on the type -text is all Japanese- with many, sometimes fuzzy period photos, some drawings and a few color profiles. Both books can be ordered from Arawasi in Japan (google Arawasitoppage), the Arawasi book at $ 25 an the FAOW book at $ 12. Friendly people and excellent service. Alternatively, the Aviation Megastore from Aalsmeer here in Holland has the Arawasi book in stock.