forest pot

Hey guys:), I was wondering if (humidity) trays could be used as forest planting pots, as they are much cheaper. Many forest planting pots are extremely shallow and the only differences I see are the holes in the bottom and the feet allowing for better drainage. By drilling holes into the trays...

What curriculum do you use to choose a forest pot? Specifically, is there a standard ratio for pot-dimensions to tree-size (height and caliper)? Other variables I’ve been considering are: number of trees, variety of tree size, preference for negative space, height of tallest vs shortest tree...