If you need to paint in a confined space, it can be helpful to build a drying rack.
The one pictured is built from 2 sheets of 1/2" birch plywood. It can hold up to 25 paintings at a maximum size of 18" x 24" per painting.
As you can see from the second picture, I use 18" x 24" sheets of cardboard as the shelves, which I slide in and out as I work. You could also slide in something more rigid (like 1/4" plywood) and rest sculptures or other large objects on them.
Plywood is available from any larger hardware store, like Home Depot or Lowes.
At the lumber yard I had the sheets cut in half so that they'd fit in my car.
I then brought them to the shop where I used a panel saw to make most of the rest of the cuts — A, B and C in the attached diagram.
I then used a table saw to cut the supports, which at 2.5" wide are too small for the panel saw. I set up an offset on the table saw at exactly 2.5" so I could cruise through the cuts quickly, letting the cut pieces fall to the ground and gather in a pile.
Just make sure to watch your fingers!