The plating differences between the model kit and the filming model look to be driven mostly by the fact that Bandai did everything in CAD and they made things symmetrical. If you compare the lower rear engine/landing gear deck from the kit (that I pointed to in the video), to the filming model, you can see very distinct differences in the location of panel lines and the little notches. There's a non-symmetrical 'wonky-ness' to the real model that the kit ignores.
Also some of the kit's molded in greeblies are oversized (when scaled up), which pushes panel lines in further out of whack. So it's just something to keep an eye out for.
That gun platform doesn't scale up to the correct size. The diameter of that part is ~3.35", which scaled up is ~11.75" but the diameter on published drawings is 11.50" - assuming I've done my measurements and math correctly, and that the published drawings are correct. Which is possible because there are errors on those drawings, at least the ones I have.
It is a good starting point though. Like I said, I did the same thing, and it will get you very close.