Last week was quite busy for me, but I did begin sketching out ideas for the UI with when everything is attached to the world builder (stylus & leap motion).
I wanted to keep things simple so instead of using two hands with the leap motion, I believe using one hand to rotate (left hand) and one hand to draw/color (right hand) makes the most sense. The left hand would be used to rotate the object on the xyz plane. The right hand, which holds the stylus, is used to pick colors and draw shapes.
Something I see potentialy being a problem is implementing the select object function. The Leap Motion is pretty insensitive and does not always map the fingers properly. I believe a two finger pinching motion (similar to zoom function on smart phones) and then rotating the wrist which subsequently rotates the object would be the best approach for this function.
Edit 4/3/13
Was able to get world builder to detect the leap motion so I am making progress in that area. In order to get the leap motion to detect, I had to use skeletal viewer once again. Now world builder seems to halt all of its functionality (drawing, head tracking, etc) but a valid hand is being tracked by the leap. This will be the next problem to tackle.
Edit 4/6/13
Hands are now showing in world builder from the leap motion. Currently the leap motion will only show hands when the skeletalViewer is selected. This week I will be working on adding the leap motion functions into the world builder application so that it is not dependent upon the skeletalViewer.