Nice build! There has been a lot of new information on Italian camouflage patterns in the past decade. One of the problems has been the red bias in certain black and white film that obscures the red brown component or made the background chestnut/sand seem darker than what it was.
A mottle like this might have been the normal three color pattern of dark olive green (NATO green), red brown over light chestnut/sand. For the light grey a good substitute is light ghost grey which has the same FS number, but might need a touch of brown imho. The internal color for cockpits was mostly a grey green close to the RAF interior grey-green. Large cockpits, such as you did in your Caproni model were painted light grey and landing gear struts were also painted such in most aircraft types.
You did a very good job with the information you had. There is also so much bad information floating out in some publications like squadron's "In-Action" series and even the old "Profile" series which is what these model companies used as their references.
Go over to Stormo! and see the aircraft in the gallery and the color guide. There are some good references there. I love the work of Chris Busbridge especially.
http://www.stormomagazine.com/index.html
Mike T.
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