I have a good Minecraft face. So I made a piston door out of my face, that is 6×7 size, making use of Minecraft 1.15 honey blocks, and a bunch of technical circuits. Triple extenders, double extenders, block swappers, moustache movers. For a 6×7 piston door this is fairly compact!
My Face: https://www.mediafire.com/file/arwmf40i2q7pii9/Mumbo_Door_%2813%29.zip/file
Filming channel: https://www.youtube.com/user/ThatMumboJumbo2
Instagram: https://www.instagram.com/officialmumbo/
Twitter: https://twitter.com/ThatMumboJumbo