Beautiful work Runar. I think with your talent you will be able to do beautiful engraving with practice. Taylor, that is indeed some elegantly simple engraving. Nice collaboration.
Regarding finishing checkering, my dad used a similar method. He used painters tape over the checkering area when adding the finish after staining (he checkered before finish and stain). After the main finish went on, he'd remove the tape, and place one drop of finish in the center of the checkering. He scrub that one drop every which way with a soft toothbrush. If it wasn't enough, he'd add another drop and repeat. He always preached to me not to use more than a drop at a time, lest one "Goop up the checkering." His always looked beautiful, and I have successfully done some modern handgun grips that way.
God Bless, Marc