I downloaded and compiled 0.1.14, and found some problems.

* I see no icons. Only the close button.
* The doxygen documentation gets borked, since it uses an external css. Which QTextBrowser does not load. There are work arounds, I hope you find them.
* I am not sure why, but the doxygen documentation I see on the Project Reference tab is not the same I get when I run the doxygen command.
* Some sub projects are not loaded.

I used qmdilib for my test, it's available on qt-apps.org.

Looks sweet, great ideas. Implementation is kinda flawky, but this will get fixed in a version or two.