I’m not familiar with Software Carpentries, but I agree that having a good tutorial for Fortran there will not hurt.
I might be able to offer the course we developed for our students here in Bonn as starting point: Introduction to Fortran — Advanced Quantum Chemistry Methods. The main focus of this six week course (3.5hrs per week) is quantum chemistry, where we cover the Fortran programming basics in the first week, before going into a domain application. The workload of the Fortran introduction might be just right for a beginner course. The material is currently licensed under CC-BY-SA, but we might be able to drop the share-alike term, if there is interest.