Actually I'm still hoping some kind soul out there will post a gut shot or two of a Spitfire. The pictures on the Ceriatone site are very low-res, and the diagram is slightly different at points from the photo. Like, the Ohms switch has six tabs in the diagram, twelve in real life, and is too blurry to read on the photo. The small, T-shaped "tree", or whatever it's called, is also different in the photo, and a bit mysterious in the diagram.
Thanks, if anyone heeds the call!