Hi all, my Google has failed me, and so I am brought here. Does anyone know how to make a 3x4 (three blocks wide, four blocks tall) piston door in 1.12.2? Preferably one that doesn't have to be installed in a hallway. Bonus points if you know how to make it so that everything hides away and the walls are seamless after. I'm quite the noob at redstone, so any advice helps!
[EDIT]: Upon further reflection, this door doesn't need to be secret, it just needs to look nice. So in that sense, vault doors are also fine so long as they look good from both sides. No gravity-block-based doors, though.