I tend to have my ladders in the middle of large rooms, on the wall, and connecting to all floors (the corners tend to be taken up with other things), I even use another tick with them and the scaffold mod.
Instead of trap doors, I use the wooden scaffold (since you can climb through them) to fill the gap in a floor where my ladders are for a continuous line without having to flip open/close trap doors.
Look in the spoiler for an example of the "Silent Trap Door" Spoiler
That is a wooden scaffold filling the floor gap, yet allowing a continuous ladder run
Last edited by LazerRay on Wed Apr 29, 2015 14:35, edited 1 time in total.