New Save 2D
Save Solid view + 2D projection with walls filling !
Use the advantages of ARC+ X10 new save 2D features
Use "camera and sections manager" to generate your camera views or sections as before and display the Solid mode related projection using red cutting planes
In your 2D generated file, simply chose to display the back edges for more details
Generate a jpg of the 3D Solid view to combine it with your 2D projection