Hmmm…
Matte painting and model don’t match because it’s a different trench.
…or…
Matte painting and model don’t match because it’s a movie.
By the way… It’s crazy to think that nearly everybody still thinks that the YT-1300 freighter that we first see in this shot:
…is the Millennium Falcon.
In fact if you watch that scene again you’ll notice that it is never referred to as such in the actual scene. A shoot out occurs where Han kills some Stormtroopers and then we see a long shot of a different YT-1300 freighter leaving Mos Eisley in this shot:
How do we know this? Because the unnamed ship in the hangar does not have the distinctive radar dish that we see in all other shots of the Falcon. I bet you never noticed it before but it’s as clear as day. Obviously Han and co did a quick switch of ships to put the Imperials off the scent.
This here? This here’s damn near the perfect post respectin’ this p’ticular topic.