I am getting married there on December 28th and there seems to be no problem with only one of us being Catholic. I am Catholic and my fiance is Lutheran. We went to my parish and filled out all paperwork, we had to give them a copy of both of our baptismal certificates, my communion and confirmation certificate, and take a precana class. My priest had no issue with us getting married in the Catholic church and had me sign a form that indicates that I intend to remain Catholic and raise my future children Catholic. He is sending all paperwork now to Our Lady of Guadalupe. We also spoke with Father Esteban and a women who works in the office there and explained groom is Lutheran and they did not say it would be a problem.
The only thing that we need to still figure out is if it will be a full mass or not since he is not Catholic.
I hope this helps