You can totally do this! Just be prepared to be flexible in some of your options. You can fly down for sure, but you will have to be responsible for getting your luggage becasue the Magical Express can't send out the tags that quickly.
Also, you may want to keep an open mind about Disney resorts, some of them may be booked. I'm not sure what your price point is, but Disney has TONS of rooms and TONS of resorts.