The 42055 Bucket Wheel Excavator has a B model, a mobile aggregate grader: which shares the mining theme with the A model and seems to be designed to sort the mixed output of the excavator into smaller and larger pieces.
But as the Brickset review states:
Unfortunately the chute is too high for the BWEs exit conveyor to feed into it if both are on level ground. Its edges are about 21cm from the ground; the bottom of the BWEs conveyer is about 18cm.
How can one modify either or both models in order to make them compatible with each other? The obvious solution would be to raise the A model on a platform of some kind, but I would prefer some kind of more natural solution.