The model is getting better. These barbettes looks fine Thunder and won't be a problem to limit firing arcs. You know turrets on some ships already can fire "through" their hull armor so if the devs want to - then can make same adjustment here. Tbh these details represent how much more armored the ship is supposed to be inRP.
As for the shell you are right.
1) The current model have this detail in front of the triple hangars - hangar control room. Its missing from this new model. If Unlucky can add it will fill this flat gap below and also give more space for details.
2) The frontal rigged hull of the shell should be made like "stairs".
Overall I really like the model. Not my type of a space ship but definitely looks bretonian - and thats all that matters.