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I would ensure all elements heat up correctly.

The egg whites will act as a leavening but fruitcake is known as a dense,rich,heavy cake and thin slices are the normal serving size.
It should be okay,good luck.

Rich fruit cakes should be cooked longer at lower temperatures. 250-300F for 1-2 hours, depending on the size of the cake; larger ones typically take more time to cook.

really simple but great recipe for mocha affogato
http://www.epicurious.com/articlesguides/bestof/toprecipes/bestfrozendessertrecipes/recipes/food/views/Affogato-Mocha-232105

Here is a link to a YouTube video that shows you how to make cake balls. The instructions begin with a cake that's already made but you can use a store bought cake mix and you don't need to bake one from scratch.

http://www.youtube.com/watch?v=dyr9WMR-GMc

For cakes your humidity level should be around 95-100 elative-humidity.
For casings your humidity level should be 92h dropped to as low as 82h during fruiting.