Sorry, obviously wasn’t clear enough… the jigs to build the panels on are larger than the containers

https://www.facit-homes.com/building-process shows a house being built of boxes made from CNC-cut plywood. The trade-offs are probably a little different than the "whole wall at a time" prefab panels; a little more local labor is required to assemble, but transportation burden is a single delivery/pickup of the microfactory and a supply of plywood instead of shipping the wall-size panels that need a large crane to move.