The Kreig system is very helpful, just make sure your settings are correct for the width of the wood. I did something similar when i drilled the holes for the closet cabinets. In the future, maybe a larger drill bit for the electrical plug or cut it out before assembly. Maybe a rubber piece to fit around the opening, to reduce wear over time. Nice job. Yes half way in things can change, for me was adjusting my design, as the access to the attic in the ceiling , caused to stop rethink the design.