Yeah, I'd trust Cey with that.
In other news, I managed to change furniture in the animal villagers houses. I just managed to import my main town's Zell furniture in the vanilla Zell I have created for my friendship level tests. The information is just before the catchphrase, if I understood right. I just need to test some more.
I'm going to see if I can get something working for sheer lulz.
EDIT: I MAY HAVE FIGURED OUT HOW TO CHANGE THE MUSIC IN AN ANIMAL VILLAGER'S ROOM. Gotta test if it's working, and then PLAY STALE CUPCAKES EVERYWHERE.
EDIT #2 MYTH CONFIRMED
Furniture can be changed (that lily record player was not there before) but things like pics of villagers cannot be put in a villager's house.
In theory, the bytes to modify for VILLAGER #10 are starting at 0x3ed9a and finishing at 0x3ede9. So, like two bytes before the catchphrase.
0x3ed9a - 0x3ed9b is the song in the room
There is a pair of nullbyte after
0x3ed9e - 0x3ed9f is the wallpaper
There is a pair of nullbyte after
0x3eda2 - 0x3eda3 is the flooring
There is a pair of nullbyte after
0x3eda6 - 0x3eda7 is the umbrella the villager is using
Pair of nullbytes after
The rest of the bytes seems to be the furniture, pair of nullbyte, furniture, pair of nullbyte, you get the pattern.
Again, this is for villager 10 because I'm testing things with that one D:
I... love you for finding this.
Seriously, thank you! So many of my villagers have terrible songs, wallpaper, and flooring. Please update us when you find 1-9 as well.