Fractures and a big crack on the aft beam of our 94' Marstrom Tornado..

A bit scared about drilling the replacement profile we got. Unless we do it just right, we will ruin a perfectly good beam. Anybody with a great way to set this up before we drill it ? We are thinking about strapping the old and the new beam together and square it up. Then drill trough the old holes. But we are looking for better ideas!

Rolf