As far as I can tell, you can still. Only with limited resources or "objects" (basically anything you put in the scene). Putting too much effects and other stuff can lag the studio, so yeah. Someone can probably give a better answer but for now you could try and test things out first.
Having played both, I would say it depends, graphically they are the same, the only thing that changes is the story... In the original Koikatsu!, you are a student. In sunshine well, you're on vacation, so, the maps are different, the dialogues are different, sunshine by default brings a couple of new poses and that's it. Is it worth having both? only if you have enough space.
What link did you download the game from? bcz if you downloaded the version of "Betterrepack" from Noisescrew. The game already comes with mods installed, but in the same folder of the game, there is one that says "optional mods" you just have to find a mod that interests you from there, and paste it in the folder called "mods"
Most are made in Chara Studio (Koikatsu Scene maker). The monster models (and or female models) are either made by themselves or just character cards floating around the internet (You can probably look up about insect / monster cards, there's probably a few if not a lot).
Sorry to ping you with this, but my KK (BR RX20) doesn't seem to have this 'UserData/Textures' folder. Am I looking in the wrong place? It's a Kyonko card.
Check in UserData/MaterialEditor/.
Mods that don't have low poly models show in free roam as black textures or don't show at all (naked character etc.). Enabling the 'force high poly' plugin under game options-plugins (restart the game after that) will make them work, but it can be heavy on your system.
