@ColdCoffee, this project screams for lasering things onto it, @ClayJar style?
[nerdy sidetrack: to this day Skyrim is the only video game where I remember doing contemplative walks in the wild for hours, amazed at what those developers had accomplished. I read somewhere that the next one is still years away, and a few days ago Microsoft bought Bethesda, and that felt like taking an arrow in the knee]
Regarding how to finish this piece, I’m on team tapered endmill. You can run them crazy fast (relative to their size) in a situation like this.