Wew lad, you don't do anything halfway, do you? I would never have gone as far as changing the girl's sleeping models, nor written any dialogue, and most definitely wouldn't have changed the action animations.
How do you do all this? Do you decrypt the files and use RPGmaker yourself? If so, when changing models, do you redraw anything or do you stitch other models together? How long have you been doing this? Why do you even do it in the first place? What makes a man go: "Hmm, yes, today I shall eat breakfast, play some vidya, and take a few hours of my time in order to redesign a Japanese eroge game for no simple reason other than to better suit my tastes."
I have so many questions, because I used to think I was hot stuff for swapping out assets in order to create shabby nude mods, but now I feel really puny in comparison.
There are some games which I modify and move on. And then there is Summer Memories. This is what you might call my showcase item. I'm at build 103, and that's after losing everything in a raid array crash, so some of my history is just plain gone. My initial commit is now January 18, 2021, but I started working months before that on this game.
Yes, I decrypt the assets, and then use Gimp to edit the images, VS Code to edit most of the data files. I only use RPGMaker MV when I need to alter major code elements. In this case I'm stitching together other assets to build the new ones. I might fix a pixel or two here or there but in general it is the original art, as I'm not an artist.
I'm not to changing the action animations yet, but I'll put together a release regardless.
Kagura, who did the translation, put together a reasonable translation initially. The DLC was pretty mediocre (overlapping text, expressions like "I'm going to fap you"). Initially, I was just trying to save space (300 MB instead of 1 GB) and have it play natively on my system. But after the DLC release, it became more about showing what could have been done if they tried.
Also don't feel puny in comparison, you need to start somewhere, and swapping assets is a good way to understand what's going on in the underlying system.