Just copying Scott J.’s email to you so others can read his response:
The Big Vert plan is designed for you to adjust the training for 3 general distance ranges: 100km to 100miles, 50miles to 100km and for races around 50km and shorter.
It includes the gym based ME progression you have liked. But it does not include a general of max strength program.
With your extensive strength training background and completing the stage 3 test in TftUA you have more than adequate strength for mountain running. You focus should be on specific strength such as hill sprints, which are included in the plan.