Well, Dave, seems your concerns over accuracy of the scheme are unfounded. I knew I had information on "Donner-Wetter", B7190, buried away somewhere. Did some digging and came up with an in depth article in Cross and Cockade Vol 44/1 complete with photos and gorgeous color profile and planview. Congratulations, mate! It appears that your rendition is not only stunning, but accurate, to boot!
Cheers,
Bud