We have built signs for many different applications. Metal letters endure for a very long time, particularly if they're powder coated. We currently powder coat all our large outside metalwork.
Cemetery signs have been included in our repertoire since the last millennium. Arched signs seem to be a favorite model for most committees.
An inexpensive alternative to a the post and beam construction is shown here. Cut out of 14 gauge steel, this one piece, four foot long sign mounts directly to the wall of the business. These signs cost a fraction of the ones shown above, and can be built and installed in a very short time.