Haa-ha, you can believe whatever. I have his drawings too from the 1961 Air Progress (same value). My research found the Cl.I span to be (12.05m Kenneth Munson) and (12.02m early version, Gunter Schmitt) and (12.04m PeterGray/Owen Thetford). 12.04m is about the middle of the values and thats (39' 6" ) = (474" ) 1/5 scale = 94.8"
I have found many errors in the Jim Morrow drawings. They look pretty good, but you know they were made 40-50 years ago.

The color info is referrenced from the following (just to name a few):
- Over The Front, vol20, #1, spring 2005, color rendering by Mr R. Pearson
-Winsock Datafile 33, Mr Peter Grosz
-Recommendations from Mr Dan Abbott