1. The interior set is built separately than the model, and I doubt full scale models were even made of the exterior. So making assumptions based on this horrible evidence is a terrible idea and proves nothing.
Yes, but we also have exterior shots (along with clear pictures of the model used in the movie) that confirm what the interior shots show. The model had a pilot included, and you can clearly see that there isn't much space in the cockpit. So there's probably a bit of inconsistency between the two, but it's between "much smaller than the FFG model" and "much smaller than the FFG model, but just a tiny bit larger than the other option".
And of course the ONLY place where the larger size is given is in EU sources where someone just declared "it's this long". You will not find any evidence for the larger a-wing in any of the movies (whether on-screen or by looking at the models/sets/etc).






