Hi Again Todd,
Another technique you can use for the Diagonal Corner and/or Lazy Susan corner Cabinet is to draw them with a cabinet height equal to your tall height but leave the doors off. Then add a fixed shelf and mid-rail with native SketchUp tools. Finally add the doors with the Insert a Door tool. This may actually take less work and look more correct in the end. However, the resulting box will be heavy, especially the Diagonal Corner Cabinet.