This design is not fully mine since mine as I did it based on qLudd’s design of a very compact dustless binary adder, which is based on Michael2_3B’s less compact design of the same thing.
It was very hard trying to figure out a way of hooking up xorgates, and someone else could probably make it even more compact.
Thanks to the the walls this design can me as tall as the build limit allows and the most significant bits expand downwards in contrast to more common designs.
by Mekelaxo