Look at the overall requirements you need. Then consider if your plans will fulfill them. I would recommend to go a bit over the requirements since it will allow you a buffer if you fall short of fulfilling the time or materials requirement.

Overall, I would tell you to convert the project to a video documentary with everything possible. Interviews with doctors, you working with doctors, you talking with your sibilings, stuff like that.

http://www.dailymail.co.uk/pages/live/femail/article.html?in_article_id=469650&in_page_id=1879

You could probably reach out to Dr’s in your area who specialize in Down’s Syndrome so you could interview them in person. That will give your project more life. I wish you all the best!!!