I used a few packages to get me there (though some of it can be done through configuration, it was just easier that way). The relevant bits in my config are:

- better-defaults (removes the toolbars/etc): https://github.com/technomancy/better-defaults

- doom-modeline (a nicer-looking modeline - that's the bar at the bottom): https://github.com/seagle0128/doom-modeline

- base16-chalk theme from base16-theme

All of the above packages are in MELPA.

And then the transparent titlebar is:

    (add-to-list 'default-frame-alist '(ns-transparent-titlebar . t))
    (add-to-list 'default-frame-alist '(ns-appearance . dark))