Child Listing

I just received a child listing for a sibling group of 4, the youngest has Down Syndrome, there are two girls and an older boy close to Matthews age....it would be my dream placement.  BUT that would be crazy right?!  Im going to send my homestudy but am thinking of also sending along some kind of persuasive letter that even though I am a single mother of three I could TOTALLY rock this gig as a single mom to 7.  Any ideas on how to convince a social worker of that, lol????  Im not the best writer, seriously feel free to comment away on what you would say......