I had a WDW Fairy Tale Wedding back in 2001. We had 35 guests and the bill was $10,500. We got married at the Wedding Pavilion and reception at Ariel's at the Beach Club hotel.
Your wedding plan sounds REALLY cool, but be prepared for a pretty high price tag for all that stuff you want, especially with 120 guests...$10k is not going to go too far, unfortunately.
Let us know how your planning meeting goes!