Now I have just completed my new trapdoor type of entrance with pistons. It looks like ordinary flat sandy ground, but when you press a button a hole opens up and a staircase emerges
It sounds easier than it was, the logic part of it was not easy, with three memory circuits and a lot of close quarter connection quirks
And the logic takes 10 times as much room as the entrance itself...
But now that I've gotten it to work I'll copy the construction over to my main base on the survival server for all to see and use once the pistons are added.
I also found out that pistons will work good as cart dispensers in our railway station. I will upgrade the spawn station as well once the server is upgraded.
You can also make wheat fields that are easy to harvest thanks to pistons, all you do is you contain a water spring with a piston, and then grow the wheat in a ditch below. When the piston opens the water flows out and auto-harvest the crops. Although when I tried it I seemed to get less wheat than I should have, but that requires more observations before I can say anything definite.