Enclosed Ladders
For my latest base build, I found a trick to make enclosed ladders to lead up to a room. I will explain below the image how to do this in a few different ways.
Extra info:
- I am abusing a snap mechanic where Ladders snap to each other, but do not get deleted when not attached to a room/cuboid itself (floor/roof). They can then become an entity on their own.
- Cylindrical Room Frames can attach to the bottom and top of a Cylindrical or Square Room to create an entrance/exit. A Cylindrical Room Frame is not considered a room, Ladders will not snap to them.
- Cuboid Rooms can only be attached to the bottom of a Cylindrical or Square Room, but not when glass. Of course they can be attached to each other to create larger rooms.
- Not affected by planetary conditions inside these enclosed stairs.
Up from a Room
Start with the below setup. The corridor to the right is just used as a snapping start to ensure positioning.
Go inside to place a Ladder, creating the opening in the roof of the Cylindrical Room.
Now make sure to snap a Ladder to the floor of the top Cylindrical Room.
Snap a Ladder in-between, aiming at the top Ladder. This will eventually create the separate Ladder entity.
Go back outside and remove the top room and both frames. You will notice how the Ladder sticks out the top of the roof and remained. This is what we will abuse 
Place additional Ladders by snapping them on top, to the height you desire. These are all their own separate entities, they will only be removed when specifically deleted themselves.
Place Cylindrical Room Frames all the way up, until the topmost Ladder is covered.
Place a Cylindrical Room on top of that.
Go back inside and notice how the ladder that used to lead up, is now missing again. This is because we removed the requirement for it to be allowed to exist, by removing the Cylindrical Room Frame that was on top of the room. So we just place this Ladder again, to re-create the opening.
Notice how all the Ladders are still there?
Climb all the way to the top and make sure to aim at the floor of the topmost Cylindrical Room. Place a Ladder after having rotated it to face opposite the other Ladders that are already there. This should create an opening to the topmost room.
Now start placing Ladders almost all the way down, by snapping them to the one previously placed. You don’t want to place the last one at the bottom, or you will be trapped of course.
Looking back up, it shoud look like this.
Go back outside again to start deleting some of the Cylindrical Room Frames to reveal the stairs.
Make sure to keep the top and bottom Cylindrical Room Frame, or else there is no entrance/exit to the Ladders at either top or bottom. They are required in this setup.
Up from Cuboid
Start with the below setup. The corridor to the right is just used as a snapping start to ensure positioning.
Go inside to place a Ladder, creating the opening in the roof of the Cylindrical Room.
Now make sure to snap a Ladder to the floor of the top Cylindrical Room.
Snap a Ladder in-between, aiming at the top Ladder. This will eventually create the separate Ladder entity.
Go back outside and remove all, besides the Ladder.
Place additional Ladders by snapping them on top and one at the bottom.
Now use the Corridor to snap Cuboids in place to cover all the Ladders. Make sure the top one is not a Glass Cuboid.
Remove the Cuboid to the side, snap a Door in place and finish off with a Cylindrical Room on top.
Climb all the way to the top and make sure to aim at the floor of the topmost Cylindrical Room. Place a Ladder after having rotated it to face opposite the other Ladders that are already there. This should create an opening to the topmost room.
Now start placing Ladders almost all the way down, by snapping them to the one previously placed. You don’t want to place the last one at the bottom, or you will be trapped of course.
There you go, a Glass Cuboid covered ladder all the way up to the top room.
Up from the ground
Start with the below setup. The corridor to the right is just used as a snapping start to ensure positioning.
Go inside to place a Ladder, creating the opening in the roof of the Cylindrical Room.
Now make sure to snap a Ladder to the floor of the top Cylindrical Room.
Snap a Ladder in-between, aiming at the top Ladder. This will eventually create the separate Ladder entity.
Go back outside and remove all, besides the Ladder.
Place additional Ladders by snapping them on top and one at the bottom.
Now use the Corridor to snap Cuboids in place to cover all the Ladders. No Glass Cuboids are required, as these are only temporarily used.
Remove the Cuboid to the side, snap a Door in place and finish off with a Cylindrical Room on top.
Climb all the way to the top and make sure to aim at the floor of the topmost Cylindrical Room. Place a Ladder after having rotated it to face opposite the other Ladders that are already there. This should create an opening to the topmost room.
Now start placing Ladders almost all the way down, by snapping them to the one previously placed. You don’t want to place the last one at the bottom, or you will be trapped of course.
Go back outside.
Remove all the Cuboids, to reveal the Ladders, including the one below the top Cylindrical Room. Replace one Ladder at the top again, as that one got deleted by removing the topmost Cuboid due to the requirement now missing.
Place a Cylindrical Room Frame below the Cylindrical Room, by snapping it in place. This is required to be able to access the top room.
You now have the Ladders leading to the top room from the ground up.
