I would give that recipe on the posted link a shot and simply bitter it with something clean like Magnum or Galena and shoot for 35 to 45 IBU or whatever BU/GU ratio you prefer in your pale ales. Unless you happen to have a feel for the IBU after tasting it anyway. You would have to take a WAG based on your perception of actual bitterness and that might be tricky because of the rather heavy load of dry hopping in that posted recipe.
FYI I brewed a rather large APA sort of like that recently using different hops ( Citra, Columbus, and Centennial ) and let the dry hop sit for 2 weeks. This was not a good idea and left harsh, astringent flavors in the finish. Three days should be adequate so make sure you follow that recommendation. I was out of town on vacation and couldn't rack it.
Looks like a tasty recipe to me.