In this passage, Paul speaks to how we are made into animated people - a beautiful workmanship or poem - to point people to Him glory. This happens by his grace to us, eliminating all opportunities to boast.
Coram Deo simply means "face-to-face" with God. It's the posture we live where we are (1) in the presence of God, (2) under the authority of God, and (3) to the glory of God. Paul, in his letter to the greater church in metro Ephesus, helps us see not only the power of God's gospel to change us from the inside out, but also how that plays out in our lives as husbands, wives, employees, etc... Paul helps us see Coram Deo living as we are in Christ.