Not quite sure of the accuracy of the family story re the iron boat.
https://oldcopper.org/broseley/journals/15.html
From your post, do you mean you are not quite sure if this William Fletcher who died 1832 is yours?
Perhaps you could post the trail you have made to reach him as a possibility. Then we can probably be of more help.
William Fletcher 1787-1832
5th great-grandfather
William Fletcher 1807-1883
Son of William Fletcher 1787-1832
Henry Whitaker Green Fletcher 1832-1895
Son of William Fletcher 1807-1883
Isaac Green FLETCHER 1871-
Son of Henry Whitaker Green Fletcher 1832-1895
Harry Green Fletcher 1912-1968
Son of Isaac Green FLETCHER 1871
David Fletcher 1943-
Son of Harry Green Fletcher
Pauline Marie Fletcher 1965-2016
Daughter of David Fletcher