Howdy, Folks! EJ Here.

I made yet another piston door... This one, too, is slime- block powered. This is the first prototype, not compacted or made any more efficient than my original thoughts and experimentation. But hey, it works. Check out the vid! (It shall be up within the hour, on my channel: EJ Monkey. I will update this page to link to that video once I finish eating.)
Downloads and videos on this page.

JavaPython's Vid:
www.youtube.com/watch?v=-c0KLmp2joM

Mumbo's vid:
www.youtube.com/watch?v=xiXBFQ-Aavo&list=UUhFur_NwVSbUozOcF_F2kMg