October this year? If so don’t try to do things that wont come off perfect this photo will be in their album, do concentrate at what you can do and work the design round it. Don’t say you can provide a service you haven’t the experience to deliver. Can you do a flawless finish on a cake?. Cakes can be stacked in any form al long as dowels . Or you could make the fruit cake a kitchen cutting cake that would take one worry away
. Im assuming your in the UK? I think America has more filling and then I wouldn’t be sure of a fruit top tier