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You might talk to someone who does vinyl lettering. You could go with vinyl for the yellow and save lots of time and money, or you could have them cut the masks for you. Then it is a simple matter of lining up the mask, pressing it down and pulling off the transfer paper. Should take only a few minutes per side. I have done masks for several airplanes including a Swift that was pretty complicated and they work very well, no seeping under the mask or anything. Shouldn't cost much, either, as cutting the mask would be VERY simple.
Bob Kelly