Here is a simple and inexpensive way to get up and running in your studio space with a few simple tools and cheap parts...3/4" PVC pipe, 2 hinges, a few feet of thin chain and some scrap lumber.
The pics are self explanatory. I'm sure you can do work-a-rounds for the hardware and use what ever works for you..
This drawing table can accommodate larger drawing pads, canvases, your picture reference, whatever and is very adjustable re: work angle.
You can fold this unit up and store it in a tight space and best of all it is cheap to make.