Like Viikate says, unfortunately there are a couple of things wrong with the replica, like being some hybrid between the Dutch and Finnish version.
The replica was made in the 80's with what was known bakc then. Pretty recent research of old Fokker windtunnel models and wreckage show what the real colors should be. Only the sand is not really clear, it's a strange color which reacts different (on photo) in different light situations. Sometimes looking a bit more dark or more light then the other time.
I had contact with several experts, and though they do not agree 100% about the colors, the colors as used in 4.09 are the closest you can get, with what is known to date. The colors at the Militaire Luchtvaart Museum are according to the experts the worst you can get. But it is hard to break with things people are commonly used to.
Note that the Fokker D.XXI's had two different color schemes.
One used on 212-228 and the other used on 229-247
And still they are different between every single aircraft.
Here are samples of Dutch colors (with RAL and FS numbers) as published in the better Dutch books about the subject:
http://www.simmerspaintshop.com/page-RG ... lland.html
You will find that IPMS also published colorlists from the same sources.
Also: Here is a TTF of the lettering as used on the Fokker D.XXI:
http://www.simmerspaintshop.com/forums/ ... prewar-66/
I'll upload simple templates there soon.
I hope this clears up why I choose for the colors used.