Bravo, well played indeed!
I am taken back to one of my favorite books of days of yore was Collecting Model Soldiers by Maj Henry Harris. He collected based on a written Order of Battle with a few exceptions the thought being you needed a plan for collecting. I was never that disciplined and have a range of figures with a few favorite periods standing out.
Flats have made this additionally difficult as there is a much broader range of possibilities than three dimensional figures which tend towards Military only. However, you don't generally find a range of mediums as well piled on, though I confess to working through enamels and acrylics before settling on oils. (I have a frightening collection of all paints hidden away.)
Anyway, impressive collection...
Mark