Is what you are doing going to be a comemoration that you will donate to PPD, or is it something you are going to make more than one of sort of assembly line fashion?
The larger you make it the more detail should be included if possible, and the opposite would hold true if making it small.
Your own suggestions could do the trick the building outline would suggest the building and the rays radiating out you could probably get away with eliminating every other one.
There is a lot of detail to deal with.
Just my nickles worth.
Gabby