Okay - I see the progression. It will be Proto-48 in 2022.
The wide sideframe business bothered me over a half-century ago, and I converted a bunch of stuff to 1 1/8" gauge. That brought sideframes in where they were supposed to be, but it was 4'6" gauge.
Then I found out about Q gauge. Too late!
in all seriousness, Proto-48 is probably too persnickety in terms of operational reliability, but it is the ultimate in realism in 48/ft.