I used a different method for lining this sucka up just right. I took the drill template and taped it to the outside box w/ 2 small pieces of masking tape making sure that the top border of the template lined up with the top border of the holes on the box. Before that I put tape all around the template (the border) with half the tape on the template and half pointing to the outside of the back glass panel.. Follow me? I put the lid on the box and centered it on the back side of the tank while butting the lid up to the bottom of the outside trim. Then, I removed the 2 small pieces of tape and secured the perimeter of the template to the back glass panel. Voila! If anyone needs pics, I can re-do the process and post up some pics.