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Bigger Airtight Doors Concept

I figured out how to make bigger airtight doors in vanilla, by using pistons. The problem of the part moved by the piston colliding with the frame is solved by using the small Airtight Hangar Doors. This one isn't bigger than what you can make with the default Airtight Hanagar Doors, but the concept can be scaled up(multiple pistons) to stuff bigger than that.

Images 2-5 show the door as it is opening, the 6th one shows how I made the lower corners airtight.

How to use:
Use the button panels on the inside, the panels outside were for testing. There's a Sliding Door somewhere on the side to get inside. Press the buttons on a panel from left to right, and wait for every action to complete before pressing the next.
The panel on the left is for opening the door, the panel on the right for closing the door.