I saw this little trick on a quilting show. Turn a clear plastic sweater box over with the bottom up. Then use a light underneath it to illuminate it. I saw those little round push top dome lights at the dollar store. They would work great. I have a light box and I use it for my redwork and other embroidery projects. I also use two layers of muslin or other fabric for the embroidery also. I use a fine point Mark B Gone pen to draw the design. It washes out easily.
Peace and Blessings