Jackson DuBois, a 49-year-old from Cooperstown, NY, spent three months in France last year working to rebuild the 850-year-old Notre Dame Cathedral, which was severely damaged by a fire in April 2019. After an estimated $767 million in repairs by skilled craftspeople from around the world, it is set to reopen to the public Dec. 8. “It’s the most amazing thing I’ve ever done,” DuBois told The Post of being part of the restoration. DuBois specializes in timber framing — a traditional building technique that was popular before the 20th century and involves using heavy pieces of timber… They were tasked with rebuilding the base of the Notre Dame spire, and adding profiles on all of the gothic tracery around the windows, including the trefoils, quadrafoils and balustrades.