I've started a three-dimensional papercut for an engagement present. My first step, after acquiring the box and frame (to give me dimensions to work around) is to begin cutting some of the elements I want included. This doesn't mean that they will all end up in the final piece. 3D is a juggling process to see what fits where. We shall see how it goes.
Here's my first two-movie session. These elements are just laid in the box to make sure they fit. In the final version they will be arranged differently.