I can include that, but here's what I do (in Inkscape):
1) I take the "original" image, size it to what I want and lock the layer.
2) I add another layer, then use the "pen" drawing tool to hit all of the points on the outline not worrying about any curves just yet. Those are easy enough later.
3) Draw points around the entire object making sure to connect the last point to the first point where you started.
Color isn't important to the actual build, it just helps for visualization. I will mention though that I use gray percentages when I want something at a particular depth. In this case, the grooves along the front.