Format Cells Based On Values In Pivot Table

I have a pivot table and next to it I added some calculations which are based on data from the table. In my "real" file, the cells next to the PT are formatted with conditional formatting based on other values in the sheet (see attached sample file). What I now need to do is add borders to the cells in columns “D:G” only if the cells in “B5” and downwards are not empty. I have tried doing it with conditional formatting but there are some other rules which contradict this setting.

The idea is to make the cells in columns “D:G” look like they are a natural extension on the PT. However, the table can grow or shrink (in length) and I want to see borders only around cells that are on the same rows as the data in column “B” (staring with B5). I think that whatever solution you can provide (if you can...) should be based a workbook_change event, because in my “real” file, the length of the table is changed whenever I select a different “page” of the PT.