I saw BBDino sold a set but didn't like the use of so many binder clips. I came here to see if a model existed and it did but, more binder clips. I have reworked the connecting pieces to slide together for a tight fit. 

There are two versions; One that has a solid wall for the connecting joint and one that has a larger tab but only slides from one way. Both work and both are scalable. 

They also have tongue and groves for stacking, if you want to make a taller box.