FileUpload behavior and multiple models

I have a Shirt which has many different images
- shirt_image
- thumb_on_image
- thumb_off_image
- price_banner_image

The files get stored in separate places (or are supposed to be). What
I've found (using a model like what is show here: http://pastebin.com/gbnLpxN0)
is that the value of uploadDir gets overwritten. Net, the last
declaration of it affects all of the other executions. Couple this
with the fact that I can't figure out how to get DS into the uploadDir
declaration, has caused me some good sized headaches.

At the moment, with the constructor call commented out and the .{DS}.
in the actsAs, this blows up... but it does work if I use the
constructor method; it's just that the files get stored in the wrong
spots...

The variable issue lead me to try using the constructor to affect that
option. However, even that has the same issues with the value being
overridden.

As a result, I have two questions... One specific and one high level.

Specific: how can I get this declaration of uploadDir set correctly so
that different models can have different uploadDirs?

High-level: How does this get instantiated (this plugin)? Does it
instantiate one instance of the behavior at run time or does it create
one for each model? If it's the latter, it's not working as I would
expect. Also, where's a good tutorial that would help me understand
the OO nature and instantiation order in CakePHP?

Thanks!

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