I found it very interesting that Cantwell’s concept model for the Millennium Falcon eventually got turned into the Corellian Corvette. Uncle George must have liked that one a lot.
That design was the Millennium Falcon for most of the time making the movie; the switch only happened late when it was decided that it resembled the ships in Space 1999 too much. That’s why the Tantive IV model is so big and detailed despite barely being in the film: Until they swapped out the cockpit (which radically changed the intended scale of the model), it was intended to be the Millennium Falcon and would have been in a lot of closeup shots.
Read https://kitbashed.com/blog/a-complete-history-of-the-millennium-falcon for more details