Update about attributes: I played around with attributes, but the issue is that they are not clickable on the product page, while the category is. I think I will use that, but I appreciate the suggestion.
Update about localization: I took a look at the plugin, and it seems pretty clunky to have something like that running on WP for a simple translation of one word (plus any plural or URL variants)... no?
Question: I also realized that I cannot find a place to rename the terms "product" and "products" anywhere. I would like it to be "artwork" and "artworks" as appropriate — would you suggest localization also for this?