I want to creating Themes for Upfront

I just had a chance to play with your Upfront theme and all I can say is "Woooooooowwww!"
Giving the ability for users to drag-and-drop design will be a great thing for those who are afraid of website because of the "techiness" of them.
I fully plan to implement this on my ProSites for my members to use.

My question is: Are there any docs or special instructions to design Upfront child themes?
I would like to develop "starter" sites for my users and allow them to modify them so that potentially no two sites will look the same, even with a limited number of child themes to choose from.