2x4 piston door important things and change/enhance

2x4 piston door
Address to the tutorial: https://www.youtube.com/watch?v=BgqyuJAqnKA&list=PLX_aRMYRR9a54pv2dripinImVbD-btSjg
Original creator: Cubey
Try My Redstone Project

Important things:
1. Places redstone below the ground, so you can use pressure plate to control the redstone torch and sticky piston.

2. Use sticky piston, so you can move the things on the piston.
3. Place 13 redstone, if more, redstone will fail.

4. Place stone bricks after sticky effective.

Change and enhance: Place the pressure plate 1 away from the door.

Change and enhance: I change the door from standing to laying on the ground. When you stand on the pressure plate, the door on the ground will open and the piston under the ground effective, so you can jump to the piston. After you jump to the piston, the door close, and piston go down. You need use the lever and stand on the piston, piston effective, and can go back to the ground.