So far, I have only worked on the regular document window frame, which includes the close/collapse/zoom boxes. Everything else defaults to Apple Platinum. However, once the document window is done, the same code can be adapted to much more easily convert all of the other elements, like tabs, pop-up menus, etc.

In the first picture, you actually see the Appearance Manager defaulting back to the Sosumi theme for the tabs and things. I had initially built on top of Sosumi, but now I am able to build from scratch and allow Apple Platinum to show through.

The windows that you see are from Kaleidoscope Schemes, but they are being run with Apple's Appearance Manager. Kaleidoscope was not running when I took any of these pictures.