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Great idea, Kahis! :)
But - I hope not! - if you brake the leg or the arm it will not easy to keep every day photos (ok, you could take photos to your leg :P). :)
I know it is not an easy task.

It is not photography but once time I tried to build a physical analemma and I didn't complete... :( But one day! :) And it doesn't need to be all 365 days! :) Have you tried it? ;)

Your niece is nice! :D You should take a photo when she will realize how can open the little "gate" :)