Arquitens are huge in comparison?
There's not a lot of difference between the final shot of them smashing together, and an image of me tacking my Arquitens Model to my Interdictor Model.
The Arquitens
model
is larger than it should be (although it could be argued the Interdictor model is smaller in comparison).
Other than that, the Rebels Teams stated that the The Rebels Interdictor was of a size akin to the Star Destroyer - that this was a new, larger take on it, and was not based on the Vindicator Cruiser for anything but overall look. The Sizing of the Vindicator was unimportant in that context.
I amke the assumption that the Arquitens (and the Gozanti) are subject to the same Sliding Armada Scale issue of the CR90 - and at which point, its more perspective of the team - I dare say that part of the requirement for the 3D Modelling would be to ensure that, at least in the context of the Show, that 3D Models all have the same relative scale - this isn't a hand-drawn cartoon of the 80s after all, and it does form a big chunk of Canon for one of the most popular entertainment franchises of all time...