I have found this thread very interesting, not least because Southend Wargames Club has decided to commemorate the 100th Anniversary of the formation of the Royal Air Force by playing episodes from the Siege of Malta 1940 – 1942 using the Tiny Wargames mat of Valletta and Grand Harbour with 1/300 aircraft and to Check Your Six rules. The next outing is at Broadside in Sittingbourne when we should be showing the Illustrious Blitz.
We too found that getting details of Italian camouflage difficult, but can I recommend the following two publications: No Place for Beginners – Battle over Malta, June 1940 to September 1941 by Tony O’Toole and published by Dalrymple and Verdun Publishing in 2013 (ISBN 978-1-905414-18-5) and Camouflage and Markings of the Italian Air Forces 1935 – 1945 by Richard J Caruana, 1987, and published by Modelaid International (no ISBN quoted).
The major problem with the Regia Aeronautica is that there were at least three distinct shades of green, yellow and brown depending on manufacturer or supplier, that it was area specific, and that the schemes were simplified towards the end of Italian involvement in the war. O’Toole’s book is chock full of photographs and colour plates, and provides as much interpretation as possible.
We also found a useful link on another site: World War 2 Air Board – Aviation Painting Guide – Vallejo WWII Air Force and Naval Color Equivalency Table, dated 23 January 2017. This provides the author’s best estimate of the mixes needed for the correct shades.
Hope that this is some help.