AutoCAD Civil 3D :: Volume / Cut And Fill Area - Pavement Structure

Civil 3d project. My familiary with actual road construction is quite basic.

I'm at the stage where  good Civil 3d practices need to be employed when generating volumes. Attach are two files showing a road section with links and layers & also, the profile.

1. Like to turn off the links first of all and show labels instead.

2. How does the total depth of the gravel road (0.3' for gravel, 0.5' for aggregate base) factor in the profile view? What shown is the EG(in green) and FG,the top of the gravel road.

3. The cross section view: Three surfaces were used, the top of the gravel, the bottom of the base and the Existing ground, Is this correct?

4. Is there two sets of Volumes?  1. Cut and Fill areas,   2. Pavement structure: Volume of the gravel and volume of the aggregate base.

5.Refer to 4. So the Cut and Fill areas need to be done first, then the pavement structure, correct. ?