Interesting, for ages I've just assumed it was a drop in replacement.
I, personally found Schurkey's article informative and just put in a reman original booster in my car as I had no other choice since I have a manual transmission and need the smaller booster to clear the clutch master.
I seem to remember some time back some guys putting 2g boosters on first gens, they are deeper but not much wider.
Regardless, good work and good information.