If you look closely, the sides of this box are tongs and grooved. You could also use wood siding.
The box is most likely assembled with butt joints, screwed together with galvanized screws.
Each corner is overlapped by 3/4" and a foot is added to the box. This foot interlocks with the box below and so on to form a solid stack. This looks like a very good design for a beehive.
What kind of wood do bees like?
If you use the wrong materials, the bees won't like it.
If you don't have time to do it right the first time, when will you have time to do it over?