Alain, thanks for the information re the Zero Undersurface Colours, The full size that I am replicating is the Planes of Fame A6M5 in its original restoration colours and markings in 1978/9 . The green was fairly straighforward,the photos I have of 61-120 show a pale gray lower colour,not the green/brown that the IJN used. The mix that I have used looks about right,but hey I might be wrong.Regards Mike.