Small 7x7 observerless piston door (1463 blocks)

Finally, it is done! For almost three years i have been trying to make a 7x7 door as small as 1463 blocks. I originally was trying to, but failed and did 1540 blocks instead. After completely redesigning the top, I finally did it! Special thanks to VipelyRS for inspiring me to try again, lol.
Mods used in this video: G4mespeed, Iris, Sodium
Shaders: BSL shaders