Thank you VERY much for your replies! I really appreciate them!
My boat still has quite a bit to go until painting. I just got done with drilling out about 170 port holes on one side of the hull  

 and started the other side. Thinning out the plastic from the other side proved very helpful as my holes come out a LOT better now than on my XXIII.
Anyway, it is decided then, WEM Schnellbootweiss on upper hull and conning tower, WEM KM dark grey for bridge and WEM KM antifouling (dark grey) for lower hull.
Now the mistery about this boat still remains. It now appears that the entirely white boat on the first picture is the same boat as the white boat on the 2nd picture, except more weathered (which also is a mistery... maybe bad paint? or painted in a rush, in inproper conditions...such as cold weather, in dock at bergen? why did it deteriorate so badly in less than a year?). The boat on the first pic if you look closely also has the dark grey deck, judging by the little posts for tying down lines.
Anyway, so it appears that the boat in the very first picture, with a white conning tower only, is either a different boat, or painting the conning tower was just the first stage to painting the hull white too. Let's hear some ideas!