This is a piston elevator based on Daftasbrush's (minecraft forum) inchworm concept. The inchworm uses two pistons one sticky, and one normal to move either up, down, or side to side depending on orientation. My elevator is two way because it has an 'up' inchworm and a 'down' inchworm. The Inchworm goes when the normal piston extends, pushing the sticky piston and then retracts. The sticky piston then extends and retracts pulling the normal piston up to the next level. This is an effective way without having too many pistons but the timing is essential and it is very complicated. It has a call then go circuit so when you press the button it calls it and then after a small wait automatically goes. If the elevator is already 'here' then it waits for you to get in and then goes automatically. I hope you like it. Included in the world save file are the schematics of the top middle and bottom sections so you can make your own.

Additional Notes

The schematics in the world download file are so you can build your own. make sure you align them correctly and if you want to make it taller just add more lift sections between the top and bottom.When embedding the bottom schematic in the ground make sure you tick "copy air"
I am Working on a three floor model-should be out soon.