Funny to think of the GM&O as a "Midwestern" road, though it was certainly that,
in part, thanks to the GM&O's purchase of the Alton after WWII. I worked for them in the home office in Mobile, which is on the Gulf Coast, so I think of it as a "Southern" road, which it was certainly, also.
Anyway, yes, I model (in OS3R, of course) the GM&O, mostly in steam (I scratch bashed a GM&N/GM&O Heavy Decapod), but I have my share of RS-1's (which I painted and decaled), RS3's, DL-109's (MTH), F3's (MTH), Williams Alco FA1/FB1 ABA set (I frame-mounted the pilots, painted, decaled, weathered and upgraded with Command Control in both FA's - that was a job!), rolling stock (some bought that way, some decorated by me), both passenger and freight. My next passenger project is a Mobile & Ohio (primary predecessor to the GM&O) heavyweight passenger train with a USRA 4-6-2.
I have a GM&O 2-8-0, 0-6-0, 2-8-2, 4-6-2 (3), 2-10-0...so, yeah, I do model it, both "South End"/Rebel Route and "North End"/Alton Route, as railfans call them (it breaks at St Louis).
It's right up there with the New York Central.
Nice to hear of your interest in the road; I started out with the GM&O sorting Interline Waybills (those from other, or "foreign", roads, as the RR term goes) not too long before the merger which formed the ICG. I was with the ICG for 15 years in the Home Office
in Mobile (there was also one in Chicago after the merger).