Dear friends,
I have to thank Mr. Linevitch for sharing all his information on this topic, as I realized that we older western modellers got an inprint from the material we received from England half a century ago and yes, I am so old!
For us the Lavochkins were as represented in a Scale models drawing of 1971:

Now I think that we should admit that this drawing was as good as the Russian colour description that accompanied the drawing:

I fear that this material was used in some Russian publications too.
Now it is good to know that the factory drawings survived, and we hope to see them in some modelling magazine, and have them used to produce some model in Gentlemen's scale...
Regards
Daniele