Frontal nose width of Brian Hanson's corrected Kitmaster ProtoDeltic
Note that the curvature of the bonnet top "hump" is noticeably flatter than on the NRM / Bachmann shell. The vertical corners are also less rounded.
This is quite confusing - the photos that I have suggest the flatter bonnet hump is correct, yet Bachmann's state-of-the-art life-size scanner equipment rendered it as having much more substance and with much more overtly-rounded corners. I'm not sure that's right.