I just love my pergola!!  My son put it together for me, pretty much by himself, because I am 80 and was only able to hold the post up and hand him things.  It fit perfectly in the space except for the slanted ends on 2 sides and he just sawed them off with a hand saw.  It is wedged between two buildings and very stable so he did not anchor it to the deck.  I can't wait for Spring when I can hang baskets and string lights. It really looks like it was custom built .