Elevator block?

[Snack Pilgrim]

Hi guys, stupid question. I'm just trying the most recent update with the skilltrees. Where are elevator blocks located? I've gone through every single tab and can't find them. I find stairs, but no elevator block. Where are they? have they been removed?

[Muffinman]

You have to unlock them from the tech tree. They're under Base, after Automatic Door...scroll down. You need a large or adv constructor to make them.