I am leaning towards using Nav Overlay so I can add multiple pages and not worry about how it fits across the page, and it simplifies the page, too. But, the window display is a bit barebones when it comes to hovering over a selection.
It would be nice if there was a background color for the menu items, so that on hover it would pop a bit more than just a text color change.
The ability to add font awesome icons to the menu items might be useful as well to give the window a little more pizzaz. Perhaps even adding a background image would be cool. These are just other ideas, fyi. The thing I think needed most is just backgrounds on the page titles, that you get in the other Nav stacks.