Hi, Chris, Thank you for getting back to me. With sensors, I was mainly thinking of two types. #1 pressure sensors, such as FSRs from sensitronics.com. I've worked with these before. That would be to get feedback from how hard a paintbrush is pressing on the canvas. #2 a way to home the "Z"/table surface (in CNC terms) for different paintbrushes. If I were to keep the arm mounted in the default way, and paint on a vertically-oriented canvas, what would be the maximum surface area it could cover? Could it cover 18"x24"? Thank you.