2 Digit Adding Machine

I recently finished my redstone 2 digit adding computer! It was my first "semi-complicated" redstone contraption so it has a few limitations.

Here is a basic list of the features:
-The user can input any two numbers from 1-5 which will be added and shown in an output on the right.
-The user can clear inputs one at a time or all at once using a "clear all" button.
-The user can toggle an enabler to ensure that inputs are saved and cannot be erased (or vice verse).

Here are the restrictions the machine has:
-The user can only input two digits. Inputting more will not break the machine but it will return an incorrect result.
-The user cannot input the same number twice.
-The user can only input from numbers 1-5 (meaning 9 is the highest sum possible following the rules)

I plan on making much more complicated machines in the future but for now this is what I have!