I stayed at the Barn at Schooner Point for a week a few years back and it was sooo lovely. Have you visited the spot yet? There is absolutely enough space there for a small wedding, I believe that Sean and Leslie own 10 acres there. I have no idea if they do weddings there. However, once a year they have an open-studio event to showcase both of their artwork, so they certainly have a parking spot that would accomodate enough cars.
It is an absolutely gorgeous spot, very secluded from the rest of the island. At night, I have never seen so many stars or experienced such peace and quiet. It would be great for a wedding!
Try contacting Sean and Leslie Hartnett by email instead of calling, because I believe they are at their home in Italy this time of year.
Please let me know if you have any other question!!