Hello; I have always been inspired by Mumbo and his mordoors so today I have made a 4 wide door that can scale to the clouds, because why not. <3
Starting with the pistons - 7 per stackable slice. The 2 blocks are needed to power the pistons with the redstone circuit in proper time.

The redstone timings are clear to see here and have to be set to this or the circuit will not function properly. This is the standard setup for a dual piston extender although the timings are slightly increased to accommodate for the extra piston activations.

Here you can wee a few layers stacked and they are all activated by the redstone torch at the bottom. Take note that the bottom stone slab is doubled up to allow the redstone torch to power the redstone dust above.

This is the open/close circuitry. A simple piston pushing a redstone block when a player steps onto pressure plates at the doors entrance and exit. This way the door will stay open until the player actually enters the build, then it will close behind them.

I cannot show the entire height of the build as that makes the pic too large to put in this post. Suffice to say that it can go higher than 15 redstone dust can power by adding a simple 2 redstone torch system to increase the redstone power to 15 again increasing the height by another 14 blocks. Repeat this as many times as you see fit.
You may be asking yourself why I have made it look this way and to answer that I will simply say - I do not like the look of extended pistons showing up as part of the door. The trapdoors are hiding a piston behind and without the trapdoor the piston head on the side of it would be visible. Without the blocks in the front the piston heads on the double extender would be showing. Basically using all this extra stuff to hide the fact that there are pistons. LOL

Almost looks super clean when opened but I am happy with the trapdoors, still looks okay IMO.

I had 17 pics to show but got it down to 6.
Hope this helps, have fun out there.
Starting with the pistons - 7 per stackable slice. The 2 blocks are needed to power the pistons with the redstone circuit in proper time.

The redstone timings are clear to see here and have to be set to this or the circuit will not function properly. This is the standard setup for a dual piston extender although the timings are slightly increased to accommodate for the extra piston activations.

Here you can wee a few layers stacked and they are all activated by the redstone torch at the bottom. Take note that the bottom stone slab is doubled up to allow the redstone torch to power the redstone dust above.

This is the open/close circuitry. A simple piston pushing a redstone block when a player steps onto pressure plates at the doors entrance and exit. This way the door will stay open until the player actually enters the build, then it will close behind them.

I cannot show the entire height of the build as that makes the pic too large to put in this post. Suffice to say that it can go higher than 15 redstone dust can power by adding a simple 2 redstone torch system to increase the redstone power to 15 again increasing the height by another 14 blocks. Repeat this as many times as you see fit.
You may be asking yourself why I have made it look this way and to answer that I will simply say - I do not like the look of extended pistons showing up as part of the door. The trapdoors are hiding a piston behind and without the trapdoor the piston head on the side of it would be visible. Without the blocks in the front the piston heads on the double extender would be showing. Basically using all this extra stuff to hide the fact that there are pistons. LOL

Almost looks super clean when opened but I am happy with the trapdoors, still looks okay IMO.

I had 17 pics to show but got it down to 6.
Hope this helps, have fun out there.
