13 holes 0.031", seams to be fine. We use Gerbv to view the gerbers, and add 1 layer at a time to check what each does. You can also add the drill file the same way to see the holes.
You can draw the SCH svg, right-click on the part in the bin, Edit Part/Schematic/File/Load image for view, if you just want to change just 1 drawing.