I really like the idea of cleats on boxes, but given that most of my gear didn't have them and used the traditional hand hold I figured to go with the flow. It also helps not to have cleats if you have to wrap your hives for winter.
I opted for regular dado hand holds and I made myself a simple jig to put on my table saw to speed up the process. I stacked up as many dado blades on my saw as my manual allows, usually 3/4" to 7/8" depending on the make/model of your saw and blades.
First, cut a piece of 3/4" plywood so that it hangs over all 4 sides of your table saw around a couple of inches. Using some scrap wood, screw 1 piece on each of the 4 under sides right up tight against the sides of your saw. Make sure it is secure and can't move around.
Then I raised up my dado blades all the way though the plywood, essentially creating my own built in throat plate. I then measured over 3" (personal preference here, what works best for you) and screwed down a long piece of scrap to act as my "fence". I have 2 different markings in the picture, one for deeps and one for mediums.
I then calculated how long I wanted my hand holds (again, personal preference) and screwed down start and stop blocks. Again, I have 2 different markings, one for sides (long) and one for ends (short).
I then just take my assembled box, butt it up against the start block, lower it onto the blade and push forward to the stop block, and lift off!It takes seconds per cut.
Done....now off to the paint shop!