When you start a project you don't stop until it is done, great dedication. Also nice results, the yellow/brown streamliner looks great.
Just an FYI, you mentioned a problem with paint bleed under masking tape, though I did not notice it.
I have used different thicknesses of striping tape that I got at an art store, made by Chartpak, to hide the line between colors when needed. Not sure if this is still available, because art of this type is all done on computers, not the drawing board now. I used it a lot in the 1990's when making prototypes for Marx Trains. I would clear-coat the model after, to help keep the tape secure.