Venessa, sorry to hear about your mom's arthritis. My mom has gone through the same thing. She's had several joint replacements and other procedures on her hands now, and can't do the artistic activities she used to enjoy.
I'm glad you found the links helpful! There are also some threads here on dummies, and a search might uncover some more useful information as well.
Alex, I'm really not sure about your question. I haven't heard of anyone submitting half a dummy, so I don't know how it would be received. But my instincts say better to submit a finished one, but maybe others will chime in?