This is remarkable approach from somebody who just starting in paper medium. It took me decades to come up with something similar and in my case wasn't happy ending after my model eventually landed in a trash bin....
Don't know whether you are familiar with this specific edge to edge assembly while working on boxy structures. Using chiseling type of blade like Xacto #18 shave off the edge at 45* of each end so after butt join it creates almost seamless edge and basically no edge coloring is required.
Not always possible and more time consuming than usual tabbed edges joint but when done cleanly it really looks head and shoulders above...