With the eight holes drilled, it is time to finish the layout lines.
First, make a mark perpendicular to the long axis of the board from the bottom of each lower circle to the nearest edge.
Next, using each of the pairs of holes, we'll need to mark lines to form an oval shape. Using a straight-edge, mark a line tangent to each hole on each of the sides of the two holes (once again, to form an oval). Extend the hole closest to the edge of the board down until it intersects with the perpendicular line you made in the previous paragraph.
Finally, draw an angled line from the intersection of the two lines above, down to the mark six inches down the board you made in step 3. Repeat this for the other three cutout sections as well.




