I Can't help you climb out of your own private rabbit hole but when I slip back into mine I use this method to measure my bikes:
Back the rear tire against a wall and measure the horizontal distance to the wall of the ST-TT intersection, saddle center, BB center, Front axle, HT-TT intersection, Handle bar tops, Hoods.
Also measure the vertical distance of these same parts.
To compare bikes, use the same wheels and tires.
Have Fun.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.