Hi there !
Actually my current implementation is a hybrid of my own systems + UE4 nav mesh system, I am basically extending the UE4 system to do fancier things!
By subclassing and extending the base UE4 nav components I can use all of their functions and the nav mesh functions as tools to build my own complex AI systems!
It’s going very very well actually!
I even got the UE4 nav system to work for the AI units in my game that is a physics-based multiplayer game, where the AI unit is always simulating physics! I had to also use a custom character movement component for that though 
Great to hear from you!
