In case you haven’t read the set reviews I did for the 2021 Harry Potter LEGO sets, they are built to connect together with Technic pins and studs.
By the way, you can see all of the previous reviews of the sets that link together at the following places:
#40452-1: HOGWARTS™ GRYFFINDOR DORMS
#76386-1: HOGWARTS™: POLYJUICE POTION MISTAKE
#76387-1: HOGWARTS™ FLUFFY ENCOUNTER
#76389-1: HOGWARTS CHAMBER OF SECRETS
#76395-1: HOGWARTS: FIRST FLYING LESSON
Okay, now that you’ve dug into the rest of my opinions, here is my picture of the front of the combination of those sets. Please note that there are no instructions on how to do this. I connected the sets how I wanted to, but you could do it however you wanted.
Overall, I think the front side looks good. It could be a fun item to display on a longer shelf or a good start to building your own full up, minifigure scale Hogwarts. I’m not sure the #76395-1: HOGWARTS: FIRST FLYING LESSON fits well there. I’d have to go back to the movies and see where they place it. I also think it would have been cool to add corners to the building so it’s not just one flat side of a building. To be fair, it wouldn’t be too hard to put corners into the buildings and connect them.
A big criticism on this side is that the entrance to the Chamber of Secrets is on the outside of the building. I the movie it is clearly somewhere underneath the castle in a cave. As it is constructed, it is just below a floor that has a roof section. If you were to update these sets, I would look to adjust the placement of the entrance to the Chamber so it is more internal to the castle.