Make a 2x2 Piston Door in Minecraft

Do you have loads of excess redstone? Then here's a tutorial on making a 2x2 piston door.

Steps

Place 2 normal pistons facing each other 4 blocks away from each other.
Place the blocks on the 4 pistons.
2 blocks away from the piston, place a block. Put a lever or pressure plate on the opening and inside.
Place blocks on the backs of the 2 bottom pistons on each side.
Connect redstone wire from the block the pressure plate is on. is on to the top piston of the 2 pistons closest to the pressure plate.
Dig a 2 block deep trench from one piston to the other one.
Have a bridge at the end going to the block before the block on the bottom piston.
Run redstone through the trench to the other top piston.
Place repeaters where necessary.
On the other side of the door put another pressure plate 2 blocks away.
Run redstone to the bottom piston back block.
Cover the wiring after testing.