I might be over-thinking that. Perhaps just the letter/number coordinate is simpler - if you can't find a component in a two square inch area, you probably have bigger problems.
Not sure how many people would really be interested in poring over half-baked schematics for a half baked luggable PC clone, but if that sounds like you, I've uploaded my work so far.#retrocomputing https://github.com/dbalsom/seequa_chameleon
G
