I have a site with projects which each has a projects structure with an associated category and a number of images.
The url is set as projects/{projectCat.first.slug}/{slug}
I want to use the structure first for a set of thumbnails for each project (easy - no problem) and then for a gallery page with full size images. Both pages will have the same set of images.
The url for the first is .com/projects/category/project-name.

the only way I have been able to do it is to make the links from the thumbnail page using
 <a href="/projects/gallery/{{ category.slug }}/{{ entry.slug }}">
and then using routing - /projects/gallery/slug/slug to projects/gallery/_entry

This works but if I have a project in two or more categories with the same name it doesn't take account of the category in the url and is also a bit messy

is there a better way