[Phoenix-D]

That might work, but they could still get in the way of clicks. And yeah, the buttons would just be floating in space. No border or anything like that.

EDIT: yep. The main buttons are in Dlg_Main_ButtonBar.bmp. If you replace the contents of that file with that nasty pinkish color, it turns transparent. Boom, instant buttons-only display.

EDIT2: here's a larger, easier to see version of the minimalist UI.