Built the guide in Creative mode and put together the screenshots using photoshop - hope this helps anyone!
Added the individual images for anyone who wanted to save/view them separately.
EDIT:
I did some testing and the total number of chests that can be placed within the optimal range for a workbench is 20.
Anything more will cause the range to decrease by one block. (placing the 21st chest decreased the range on the Right by one block, the 22nd chest added another decrease to the range from the Top by one block)
This total number is for both single and double chests, (ie: 10 singles and 10 doubles ✅ , while 20 singles and 20 doubles is ❌ )