Modders have been going hog-wild with Zelda: Breath of the Wild for several years, doing anything from changing characters into humorous new models or creating new content for the game. Intrepid modder Waikuteru is currently working on crafting an entire dungeon in the Breath of the Wild engine.
While re-creating existing Zelda content has been done before (by this same creator, no less!), Waikuteru is boasting a full-scale project that involves Skyview Temple from Skyward Sword. They call it a “fully functional custom dungeon,” with “custom backgrounds and battle music in shrines” as part of a 3.0 update of the mod, complete with HD textures.
You can get an extensive 4K look at this feat in the video rundown below, where the creator spends close to an hour walking you through the dungeon and its various locations. I think at this point everyone is hungry for expansive traditional dungeons in Breath of the Wild 2.