Is there a way to place cabinets in this corner, using CA's standard cabinet tools, so that I get a nice "pie slice" filler? I can't figure this out, and any help would be appreciated.

Sure. The trick is pretty simple: 1. I used Angle Front Cabinets and set the Left Side to 1/16" Depth 2. I set the Back to "Match Front" 3. I rotated the Cabinet 180 degrees so the Back is now facing out. Attached are the Plan and the Library containing the 2 cabinets. Obtuse Angle Cabinets.zip Cabinets - Obtuse Angle.calibz