This section will focus on building a complete, useable script.  It will be based on the
3d checker script from the first section.
Currently that script is something that you put in the script editor and run as-is.
We'll give it additional options, and build a user-interface for it.
If you don't feel completely comfortable with the material from the previous section
you may want to re-read some of it, but don't worry, it should all get clearer as you
begin to actually use the knowledge in this section.