I think I have a good understanding of some of the key systems I will need:
Character Generator; Build a party of 4 to 6 characters
Class System
Race System
Turn Based Combat System
Spell System
First Person Explorer System
Quest System
Dialog System
I am looking at doing the Character Gen piece first, which would include all the Class and Race systems. The feedback I am looking for on the UMLish diagram is the basic BP/Classes that I think I will need, if it looks correct. I wanted to do the UML diagramming or system design diagram as a way to test/use the Enterprise Architecture tool the company I work for sells.