I recently did my first one and took it to work..coworkers were fascinated! I just giggled because it was so easy! I iced the cake in IMBC and put the kitcats on...they stuck beautifully.
Some people made the mistake of sticking their hand in the top thinking it was a candy bowl. It was pretty comical!
I have made several of these jCandy Cakes just recently, they are enjoyable to create!
Anyway, I frost the cake as usual with buttercream and let it crust. Before placing a kit kat on I lightly mist a section of the cake with vodka. Misting the crusted buttercream with vodka causes the kit kats to stick really well and stay put!
Another tip for you is to use a very sharp thin bladed long knife to separate your kit kats with. If you try using a standard steak type knife it is likely to not give you a clean cut. Have fun! 
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