Can you annotate where the entrance is, and also what is the big white space at the bottom. Is it practical to have a total around the room continuous loop, perhaps with a lift-bridge at the entrance? Defining the space is key to knowing how to proceed.
John, the white space is remaining area of the room we would like to keep clear and open. This space is set in the upper left corner of a much larger room lengthwise (to the right of the closet) that otherwise is set up for other use. The entrance to the basement from outside is on the left, marked as patio door. In the upper right is a closet door that needs to remain unobstructed. The inside entrance door at the bottom of the staircase leading to this basement is clear on the other side of the room and not a consideration at all. I'm okay with a lift bridge entrance or duck under for access to the interior of a walk through plan somewhere along the bottom of the green area.
Once I have this space cleared out of all debris, I think I will take photos of the area to help lend perspective. We are a good ways away from that at he moment, however.
I should add, that my hand made rendering of the area is not exact. The space is actually 17 ft. some inches by 9 ft. some inches. The idea is to build (or shoe horn, perhaps) an 8x16 benchwork within that space.