Thank you Manni and Rick. About the colours I did't mention them, sorry. Having no sure reference I tried to match at my best with colour profiles of Marc Chassard's book and the CSM instructon booklet so don't take them as real colours. My choice was the following:
Vert clair (light green) Mr. Hobby H58 interior green (I tried before with H303 green FS34102, but was unsatisfied and oversprayed with H58. It's looking slightly darker because of the undercoat but I like the final hue)
Marron (brown) Tamiya XF10 flat brown
Bleu clair (light blue) Tamiya XF23 light blue
Undercoat was flat white with black preshading for wing spars and ribs. Protective blue for metals, struts and contour tape is Tamiya XF18 medium blue.
I hope this can help, at least as a starting point.
Ciao
Giuseppe