I'm just a beginning woodworker, so take what I say with a grain of salt.
I will be building boxes this winter, mediums and a top bar hive. What I have learned from my mentor and some experience building cabinets is that a tight glue joint requires clamping and/or screwing before the glue sets. After planing for an even thickness, we run the boards through a jointer before gluing and make sure the joints are tight and even during the setup, then do a final sanding before assembly. I may use the dovetail jig just to get more experience setting it up but likely will go with squared butt joints for the corners, exterior glue, screws, and exterior paint. In my experience, with properly clamped and glued joints, the wood breaks before the joints do.
Good luck!