Been a long month, still just trucking away at the game...
I think I'm starting to get a good idea of overall structure and game loop.
As far as game loop goes, I tried to keep it fairly simple. Navigation -> Dialogue -> Combat -> Navigation.
Idea was to go to different location to complete quests, find optional story points, etc. I'm hoping I can pull it off well enough to make it not so tedious as the previous games and keep it feeling fresh.
The initial milestone is to complete chapter 1 by August and publish it for beta, but we'll see how far I can get.