ion one of the update videos in beginning when the piston and blast door came out, you cann see a a little video where you see a hatcxh opens and a platform rising from underneath and a turret on top. as i can see they used blast doors for this amnd most likely pistons. but when i make this platform of blast door, i am not able to attach anything under it wich means i cant get it to connect with any kind of pistons as i cant build over or under it. so how the heck do i do this?! i want to make exact same thing for use as elevator. please help.