^thats a good point you make there. They could technically not even need to remold new doors and make some body modifications.
I agree with your take on big cars. I wish somebody would make a modern Escalade and big SUV's/trucks in full diecast. In general, which is something that we haven't seen from this hobby since the early 2000's. The specs of the K900 sound pretty good, although it was unfortunate that you had a lemon. But that was a true full sized RWD car that didn't cost an arm and a leg, keeping with the tradition of cars that Americans have traditionally liked.
Big cars, sadly, now only exist in our memories and companies like Xiaoguang. That's why I have some hope in them. Its unfortunate that throughout the years, full sized cars became extinct and Intermediates became the "full sized" cars (to me, these are not true full size cars by any means, but it is what it is). And now that Ford and Chevrolet have announced plans to stop producing Fusions, Impalas, and Malibu's (not to mention the Lincoln's and Cadillacs that spawn off of them), we're looking a segment in which there will be no American cars in! If you had said that to somebody back in 1980 (or later) that this would be the case in the 2020's, they would've thought you were out of your mind.
Back to the topic though, I wish Xiaoguang would go full retro and make the big cars of the 70's (and some from the 60's and 80's), but unfortunately, due to geopolitics, not many American Big Cars were probably imported to China before the Nixon Administration (at the earliest, perhaps) so that means (since these cars are dealer additions of cars that were said to be popular for Chinese businessman) the time line for cars that they'd make is probably mid 70's forward. Seeing that China's neighbor, Kim Jong Il, had big Lincoln's, I guess we could hope for a late 70's big Lincoln maybe? Either way, it might be more realistic for them to make cars from the Ford/Carter Administration era vehicles (or newer) moreso than Nixon.
I do wonder if the Chinese liked the bigger FWD cars of the 80's? I'm more of a GM guy, so I wouldn't mind it if they made C-body, H-Body, or K-Body cars. I'm biased towards the Cadillac Seville myself. If I had to throw out a guess, I'd say it's possible that they could be thinking of early 80's Cadillac Fleetwood or Towncar as well because they've obviously thought highly enough of their 1990's counterparts to produce them. For them to do a Lexus LS400, it's also possible that they are thinking Toyota Century or perhaps Honda/Acura Legend?? But that's just my mindless speculation though. But anyway, I'm just happy we are having a conversation about a niche hobby market that some diecast makers apparently didn't know existed.
Let's hope the Town Car and LS400 make it to production sometime this year!