HAM Projects 1-Wide Adder (outdated)

Important: Please see my updated design for a more efficient adder.
rnrn

Log 1- I'm in the process of creating a 1-wide adder module. This will allow for the contruction of ultra-compact calculators with nearly no buses, although it will be extremely slow. I've successfully created a 1-wide xor gate with inputs on the same side, and an accessible carry out and output. It may be a little over-complicated, but it is a good first draft. I haven't thought much further ahead than this gate, but hopefully I won't run into too much trouble. Any thoughts, help, etc is appreciated!
rnrnrn

Log 2- (finished product) I have successfully created minecraft's first 1-wide adder. It utilises a pre-made bus, and functionning inputs and outputs. There was an extremely abundant amount of problems, but it only took an hour or two to resolve them all. The finished product is relatively slow compared to most adders, due to the neccessary use of repeaters. It is also very long and high. Nevertheless, it is very usefull in situations where floorspace is needed, as it is both the "skiniest" possible design, and also the only design that requires no bus to reach the inputs. [/
note: When assembling the adders, make sure to connect the carry ins correctly. I uploaded a 2-bit segment to use as a reference. Also, please refer to this design as a "ham adder", as I put a lot of effort into this and would love the recognition :)