I got a number of pads of paper for Christmas this year. The original of the piece below fills an 11 by 14 sheet of paper and is the first pencil and ink I've done of that size in years.
The hall has a sunken cneter section about 9 feet across (a little less) with a minor dip in the center to facilitate drainage. There is a raised platform to the left a little under a yard high and a yard wide, it wraps around to the left ahead. On the right we have stairs leading to a platformed height of about six feet that is about 6 feet wide, travel along the right down the corridor is blocked by a hefty door. There's a pillar there because I wanted to draw one in. The main corridor is about 18 feet wide and 20 feet high.