Not enough time right now to comment very thoroughly, but I am very interested in this project and I believe I understand categories pretty well, so I'd like to be engaged with this aspect of the project.
As I indicated before, I think the Palatine Ancestors category should be repurposed to hold the ancestors of Palatine migrants (i.e., people who never left Germany; compare Category: New Netherland Ancestors) and a new category should be created for Palatine Migrants or Palatine Immigrants. That new category should become the basis for a new template for the project. Don't try to divide it too finely by geography or date -- those details can be difficult to work out, and some immigrants moved around a lot, so it is most efficient to have one main category for this group. Special topics can be treated in additional categories -- or by creating Free-space pages that can be linked from the text of people's profiles.
Skeeter Lansing recently created Category: East Camp, New York for one of the camps where the Hudson Valley Palatine immigrants were impounded. I think that West Camp already had a category. These kinds of place categories can be very useful. But place categories should be treated as independent from Palatine categories (don't create "Palatine Immigrants to Schoharie County, New York"; instead put the person in Palatine Immigrants and also in a place category for Schoharie County).