This door drops the gravity blocks (concrete, sand or gravel) and pushes them up on the sides. Afterwards they will fall down again to close the door. It mixes up the patterns.

The last part of the gravity block door series, this time taking it to the extremes with a 24x24 version. Moving 576 blocks to the top is a massive task so it uses 16 block elevators, each one pushing 36 blocks to the top. Because of this the opening/closing time is only about 1 minute and 20 seconds.
the bottom sorters are split up in two parts, each sorting to 8 elevators. Combining the 8 elevators to one layer was difficult and had to be timed perfectly, because the whole build breaks when it's not timed perfectly it required more then 60 versions to get to the final version.

Small it's definitely not being 38x11x82, meaning its total volume is 34276.

To make this all work it uses:
2000 concrete powder
1002 wool blocks
119 glazed terracotta
104 obsidian
76 glass
32 slabs

517 redstone dust
406 pistons
316 sticky pistons
393 observers
156 repeaters
149 redstone blocks
128 slime blocks
35 honey blocks
60 noteblocks
59 hoppers
18 comperators
4 barrels
1 log
6 leaves
1 torch

Feel free to use this however you want, or use the concept for other builds.