Major Cathedral Project in Full Swing During Easter Season, to Debut Next EasterSitting in his office in the lower hall of the Cathedral of the Holy Cross this week, Father Kevin O’Leary is a flurry of activity – opening mail, taking calls from Cardinal Sean O’Malley, confirming Holy Week arrangements and – on top of all that – managing a $25 million restoration project at the seat of the Archdiocese of Boston, the Cathedral in the South End. …