Hi Pauline.
Great question - but I have a better question.
How would you add bones to the fingers?
What do you need to do?
Why not put your skills to the test. If you get stuck or need help, you can post in as the exercise and let me know what you're struggling with.
You will run into a few issues, but trying to solve them on your own will do wonders for your skills.
Go, Pauline, Go!