The chosen paint scheme for my restoration uses gold outlines for all the trim. The broader stripes are easy enough to hand mask but I plan to use masks for the N-numbers and smaller details. I will produce the masks myself with a vinyl cutter which I've done before for single colors. Is there an accepted method of masking for multi-color items like the N-numbers? My initial thought is to produce separate masks for each color with registration marks for alignment. That would need pretty tight registration. Is that realistic or is there a better way? I'll need to do national insignia for another project so it's a broader question of how best to deal with multi-color paint masks.