I wanted to make a set of French doors open the opposite way.  I designed this template to allow me to perfectly cut hinge pockets on the opposite side of the door jam that were aligned perfectly to the old hinges.  This template would also work perfectly to cut hinge pockets in new door frames.  I had to do a couple revisions but in the end this fit my hinges perfectly as you can see in the pictures.  I bought these template following router bits for the job.  [https://www.amazon.com/dp/B08HJF3H1D?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1](https://www.amazon.com/dp/B08HJF3H1D?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1)  Hope this helps your project!