Converting a recipe that uses commercial yeast to a sourdough recipe

Have you found a great bread recipe that uses commercial yeast and you want to convert it to one made with sourdough starter?

Jacob Burton gives you a headstart with an explanation of the Baker's Percentage and then tips on how to convert recipes:- 

Baker's Percentage
https://www.youtube.com/watch?v=7YTIrgv4JCI

Converting Any Bread Recipe to Sourdough
https://www.youtube.com/watch?v=wUjj4wNSEb0

Here are the podcasts that Jacob mentions:

SCS 018| The Four Pillars of Bread
SCS 019| Twelve Steps of Bread
SCS 020| Bread Classifications
SCS 021| Sourdough Starters and Preferments
SCS 022| Let's Bake Some Sourdough