On 2/17/2020 8:20 PM, Robbie Brusso wrote:
Haha sorry for the confusion - I guess my concern is the cabinet floor (bottom of the cabinet). I've
usually just used pocket holes and joined to the sides that way. However
I wanted to use box joints this time. But then I started to wonder if
glue alone would secure the bottom of the cabinet to the sides. If it
helps at all, this is a wall mounted cabinet that will go above a toilet
in a bathroom.

Box joints are more than strong enough for this purpose. You're wringing
your hands for nothing. If you're thinking the glue will fail, (it
won't) you could pin them with a dowel which will even enhance the
esthetics of the joint. My first workbench with drawers I built the
drawers this way (45 years ago), before I realized how strong glue was.
Box joints have lots of good gluing surface, making the joint very
strong. MUCH stronger than pocket hole joints.

--
Jack
In Youth we Learn; In Age we Understand