Location: 05 Metals
A steel pipe column. Pretty simple.
Why use it instead of an actual column? Because columns are evil. Not really. Columns are evil, because they interfere with walls and allow walls to interfere with them. But the reason to use the object is so you can still show the column solid when you set the construction fills' display option to 'Empty'.
Trust me. I'm going to get all this structure plan stuff pulled together real soon.