FWIW, there are quite a few pics of other colour schemes on Sirius. There is a white one on
http://www.dmairfield.org/airplanes/NC117W/index.html
which I like a lot.
There is also the colour scheme of Smithy's Lady Southern Cross (Altair, but cart is the only difference) at http://www.adastron.com/lockheed/altair/altair2.htm (side views only).
Beautiful colour 3 views of the stages Lady went through here:- http://www.adastron.com/lockheed/altair/drawings-io.htm

hth somebody.
jp