You slice it on the diagonal after you frost the layers (obviously you don’t frost the top until after you cut it otherwise you’ll end up with sticky fingers). You don’t cut it in regular slices. You cut it on the long side. You’ll end up with about four slices.
I've used this for gingerbread houses.
For the "acorns" quickly dip the cookie into the melted sugar using tongs....then attach the kiss.
A thin pretzel stick piece would make a good "stem."