I have just looked at the lug-lining pen link. Interesting. Many years ago, as a draftsman, I sometimes used pens like that for drawing with indian ink (although they were already considered old fashioned and had been replaced by various types of fountain pens). The adjusting screw gives fine control over the line thickness. I would never have thought of it as a solution for lug-lining, but I would expect it to work well.
From memory, the important things for getting an even, blot-free line were:-
- a) not to get too much ink into the nib (probably about 4-6mm from the tip) and
- b) to keep a dry cloth in your other hand to wipe the excess ink from the outer surface of the nib, immediately after dipping it into the pot.
That was all for ink, but I am sure the same will apply for paint.
I look forward to seeing the finished result. (I might then get my old drafting stuff out of the loft and touch up some bike frames.
On the subject of colour, my vote would be for the deep blue.