it seems that it is possible to modify the lettering specific to a nation:
Added Mat Managers white lettering (Normal) to RAAF/NZ aircraft and put all updates into one RAR (103 Megs). This is not a official version.
Source:
Unofficial Mat Manager 2.37 Full
So how to do it? I would like to modify the colours and the fonts of the finnish lettering, is it possible and how to do it?
cheers,
Jan