They're cool cars to have. I was trying to figure out which GMP model had functioning windows and that car came to mind! I'd be scared to move them in fear of breaking something. LolI have the Acme '70 W-30 in Sebring Yellow, it's formidable! One of my favorites, not surprised to hear those are appreciating. And the '72 W-30 Convertible in Radiant Green is on pre-order right now
As for cranking windows, that's an insane feature! I do have one model with actual functioning window cranks - the GMP '70 Plymouth Hemi GTX. I rolled one up halfway and down to make sure it worked and left the other one alone; I was afraid of snapping it off.