I printed a full scale pattern of my hole layout and taped it to the side, centered punched them and then setup my drill press table to 10 degrees. My drill press table tilts, so setting the angle is pretty easy. Then I attach a guide strip to the table so all I have to do is slide the piece along the rail drill 7 holes, flip the box drill 7 holes ... Then I readjust the guide for the next group. It take about 5 to 10 minutes to drill the 84 holes.
I do have the complete drawings done in AutoCad.