The AN-225, one built, is derived from the 124 but longer and with a new wing with 6 vs 4 engines and it's the biggest plane in the world to my knowledge, I just checked and it seems the length and wingspan are a few meters bigger than the A380 however I'm not sure how big the C-5 Galaxy is, or the Spruce Goose for that matter, but they are all among the biggest planes in the world for sure. Walking thrue a C-5 must've been a fantastic experience.
A glass-cockpit 182 sounds interesting but I think the whole cockpit should be redesigned to get the most out of the instruments, like some cars have it, but that would also require non-std. shaped screens and a new non-flat panel and a new seating-position etc. but I think it could be done though, just not in old designs like the Cessna singles. Btw do you know if it's still required/needed to have analogue/mechanical back-up instruments? I don't know how reliable electronic instruments are in airplanes but I've seen many glass-cockpits in airliners having classic instruments inbetween the new ones, I'm playing with a concept-cockpit so I'd like to know if I need to incorporate round instruments as well.
Back to classic planes then I think there's a Spitfire in a museum (that also has a public airfield) in the west-coast of Denmark and many other classic planes including a few that only exist one of now, and several fly regularly from their airfield so you can see them, I wish I could visit it some day.
Btw do you know if the YF-23 is still intact, I heard at least one of the two was put in a museum on display without engines (there were two ATF-prototype engines, one of which is used in the F-22 I think, the two YF-23's each tested one of them), and if you know, is it possible to look into the cockpit of it?
Btw speaking of cockpits, the Starfighter in the museum I visited last year had a ladder up to it and a open canopy, a row in children in fact climbed in it, and not far from the plane and behind the Caravelle, you could also go in, was a old full-cockpit flightsimulator from an old airliner, but I can't remember which one.
Greetings
Frank