professional carpenter dave kahoon.ing furniture is usually an easy job but he admits this one is daunting because of who it's for. >> the holy father is going to be here and it has been ready for him in time. >> reporter: pope francis will sit in an hand-crafted chair when he says mass in front of thousands on wednesday at the basilica of the national shrine of the immaculate conception in washington. it's especially meaningful for kahoon. he is a deacon at his church in maryland. >> an honor and it's an opportunity for me to give back the talent that god has given me. the base is made out of wood. >> reporter: he also built a new altar for the service meticulously hand painted to march the marble inside the basili basilica. after the papal mass the new altar will replace this one as a permanent piece of history. >> reporter: using the one that the father used reminds of husband his presence. >> reporter: -- >> that is the exciting part about it. >> reporter: the chair was delivered ahead of schedule be he says he won'