Since the tail of the lag screw rotates but does not retract (does not retract into the housing), the minimum dimensions of the box will be limited by the mating of the screw tail. Compose the box and you will see how the clamp tails met inside the box. This is where the size of the mini is limited - it seems to be about 25 cm by 25 cm, the minimum box assembled with these clamps can be made up. This cannot be called a disadvantage - this is a limitation on the size of the box that I have identified that can be glued together. in one of the photos it can be seen how the shank rest against each other. Learn it.
I added some photos to give others a better understanding of my experience.