Just a simple switch of most of the paintings and such in Framing Frame/Art Gallery to Kagerou Project/Mekakucity Actors artwork (only the existing 30 Or so in-game by default, didn't touch the extra ones because I'm a lazy ****). I used MP83's Templates for editing, so I have to give credit where it's due;
https://modworkshop.net/mydownloads.php?action=view_down&did=16250

Otherwise, all the artwork belongs to their rightful owners and whatnot, extract the "KagePro Art Gallery" folder to the mod_overrides folder to work and that's really it. Oh, and I don't like the streetlamp banners, so I might change those, otherwise nothing much else.