Well I think I'm about to have a brain aneurism ! According to the box art the camo is light green dark green and brown ( I'm doing the Luftwaffe version). According to the instructions, it's light gray, light green and brown. This appears to be how they were painted in the Condor Legion. Now if I understand right they were retired to a trainer status where the insignia was changed but not the paint scheme, (please correct me if I'm wrong ).
Now, back to the box art, from what I can see after surfing the net the LGreen/DGreen/Brown scheme was used on the later versions with the radial engine supplied as transports to the Eastern Front.
I'm pretty sure if I paint it with the grey green brown pattern I'm on the right track. If anyone can verify this then please do. Don't mind committing myself just as long as it's not to a nice one room apartment with no windows and nice soft walls !!!