Offset pattern on turtle

I am trying to creat a raised pattern on the back shell of a turtle (yes a turtle)  See attached to view.I think I have the work flow down.  But my problem is in creating the

2D sketch pattern so that it translates properly onto the shell.  I have also attached the sw file (2010) in a rolled back state to the shell area.  Would appreciate any help, as I can't seem to switch from left side to right side thinking ......

SolidworksGeneral