Cool - be sure to check and double check the orientation before drilling and sawing! - I just finished up a couple. I sawed one on the wrong side and drilled the other one on the wrong side. I messed up the juice groove on a cutting board recently too. I have to learn to take much smaller bites with the router. - Dave
To that end here is what I do to avoid that most of the time.
1. I have a dedicated fence for my drill press. I use the laser to be sure the drill will hit my marks.
2. I have an adjustable square set on 5" and a good set of brass setup blocks
3. My sliding cutoff jig from Rockler is marked to assist even if I forget
4. It works!
PS -as a biologist I strongly urge you to stop using a juice groove. The bacteria that get in there are impossible to get rid of. It is always rough. Once I explain how my boards are smoooooth everywhere and a conditioned to prevent bacterial buildup - THEY AGREE AND BUY MINE.