Called Private Dining for AKL at 407-938-4720, and spoke with Virginia (very nice and helpful). I explained that I wanted to order a cake for an upcoming visit, she asked if I wanted it delivered or would be picking up. When I said delivered, she asked if I had a resort reservation. I gave that to her, and she found my reservation. I am guessing the cake order with private dining will show on the reservation. I then explained what I wanted (see below), and she took the order. After consulting with the restaurant baker/chef she came back with a cost, and asked for my credit card to hold the cake order. Just told them I was looking for a Frozen them for our two daughters on their first WDW visit. Went pretty well.
Order:
8 Inch Chocolate Cake
Dark Chocolate Mousse Filling (they only offered Dark Chocolate Mousse or White Chocolate Mousse, but wife loves dark chocolate so we're good)
Whipped Cream Icing
Frozen Theme - Was first offered the printed charter top, but declined. Sounds like a light blue icing (frozen color) with snow flakes of some sort, and Have a Magical First Visit (or something like that) written on cake. Sounds good to me.
Quote was $55 (cake, delivery, misc, and tax)
Will take pictures and share results afterwards.
Thanks again.