These models are in 1/144 scale, and the colour schemes and markings as historically accurate as I can make them.
For example - from this photo:
In more detail, and coloured, from a variety of sources (like that photo)
And the original 3D printed model in nylon...
My interpretation - dimensions of model
IN: 2.013 w x 1.998 d x 0.773 h
CM: 5.112 w x 5.074 d x 1.964 h
Some more
To gauge size - an Australian 20c piece is about the same size as a US quarter.
Turkish planes from 1918
Aircraft of various factions in the Russian Civil War - Don Cossacks, West Ukrainians, East Ukrainians, Reds, Whites, Freikorps, Knights of Malta, Lithuanians, Poles...