Feedback/Insight Needed - RPG Game rough BP/Class setup

I am interested in developing an RPG game in the style of the old SSI Gold Box D&D games (https://en.wikipedia.org/wiki/Pool_of_Radiance)
Here is a rough idea of the BP/Classes I will need at least to start with, minus a Race BP/Class which I have not put in yet. The game will go from a First Person explorer view (like this:http://www.weekendwastemonster.net/crpgs/pool/dragonbait/1.png or Legend of Grimrock http://pcmedia.ign.com/pc/image/article/122/1222602/legend-of-grimrock-20120409025915077-000.jpg) and when combat happens transition to a turn-based game play (like this: http://www.myabandonware.com/media/screenshots/p/pool-of-radiance-1u2/pool-of-radiance_9.png)

Thank you
Delak

What type of feedback are you looking for?

I would design the game first and then figure out from that what systems you need. You don’t need a full UML diagram for the game.

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.