If constructors were made just a tad thinner, then I would be able to line them up neatly when bringing conveyor belts through the wall.
For example, build 4 walls with centered conveyor windows feeding the conveyor into constructors. Only 1 of the belts will be straight and aligned to the window, as the remaining 3 constructors will be pushed over further with each one you place.
Storage containers and smelters line up nicely as they are thinner than 1 foundation block.