We’d like to encourage the exploration of ArcMap automation tools like ModelBuilder and Python scripting, and propose a code challenge event associated with our meetings. Here is a link to materials for the initial challenge, which includes one possible solution. In the future, we’ll post the challenge here about a month before a meeting and challenge you to turn in your solution for recognition.
https://www.dropbox.com/sh/ravbh0cbsfzh75m/AAAmCDJzdXyv-fNCowT5KJFDa?dl=0
SE Washington and NE Oregon GIS User Group 
Trying to figure out what you mean by “includes one possible solution” and don’t see what you mean. Then, I realized that there must be something in the supplied toolbox, but it is empty to me. Suspect because it is newer than 10.0. Might want to keep that in mind and supply things in either multiple versions, or older ones for those of us not as of yet caught up to the rest of the world :)
R_
Thanks for the post! The file has been updated with a 9.3 Toolbox/Model.