Nice one, I'll have to go take a peak at some stage.
I finally got to play with pistons and really enjoying the creative side of what you can do with them, gotta love moving bits, reminds me of the moving parts of the old Meccano sets.
I experimented with creating a staircase unfolding, then thought, ooh it would be cool to hide the staircase with water and have it flow down, and then disappear to reveal the stairs, and then thought I'd like to hide the switch and create a secret door. Hehe was all good fun, and surprisingly not too difficult. Got it all working in a day.
I never really got circuitry in minecraft but starting to understand it a little now. Couldn't understand those diagrams on the wiki.
Tp to me for a looksee if you want to see it in action. I also tried a short cart track that triggered music, crushing wall, and opening staircase prototype.
Oh my brain is in hyperdrive thinking of fun things to try out.