For this modified oscommerce shop, there are a few elements missing.
-Add a "brandpage" to the menubar with all the brands.
Clicking the brand, should show the productlisting of course.
-The difference between a new category and a next line of the same category is not clear. On subcategories it is much more clear.
See screenshot category / subcategory.
Also change categories "ons assortiment" to 2 columns
-Change some menu-text in the administrator.