Is there any way I can add an extra sidebox to show vehicle makes rather than all my product categories?

I have managed to duplicate the categories and name it vehicles but obviously it still pulls "categories" from the db.

If i can show a list of makes then linking to models in one sidebox that would be great, just not sure how i would have it all linked.

E.g. i want to show:

VEHICLES

x Make
x Model
x category
x parts available

then categories to display products as normal but not displaying makes or models.

Hope this makes sense

To maybe understand a little better here's my site:
http://www.rstuning.co.uk/zentest/index.php