The pilot dome wasn't too much of an issue. MGagen had posted some very good drawings of the bridge based on Jefferies' original drawings that both matched with the images I have of the pilot configuration and the later cut down bridge (which I have photos of off the model and next to a ruler). That made for a nice set of sources which confirmed each other. Of course I also got a lot of additional photos of other parts with nice ways of getting measurements... which I haven't had the chance to completely check against what I already had. But so far everything seems to be on the right track.