Nice job and I second the comment about the excellent alignment.
As for the sanding, I have two possible recommendations for next time (because now you’ve set a precedent and people are going to ask 
)
One would be to maybe not mask at all. If you’re going to be sanding anyway then not masking is no big deal, you can sand the engraving residue off. If I go that route, I like to use a soft paintbrush to clean the sanding dust out of the engrave as a final step before finishing.
Or option two: you might want to use something a bit less sticky than blue tape. Dedicated masking is easier to use and requires little to no cleanup. Here’s a thread about my favorite masking brand:
Anyway, of course there’s option three, which is keep doing what you’re doing; you’re getting good results as is