I can only sedond what's been said here, including posting the second verse. I would describe the melody of The Good Reuben James to be a variant of Wildwood Flower. The second verse goes:

100 men went dowm to their dark icy graves
when the good ship went down only 44 were saved
'twas the last evening of October
they saved 44 off that dark Iceland shore

repeats chorus. Great song, Branwen. I'll play it at the next YOBB session (If I can ever get back there). The melody flows nicely out of the chords posted here - but it plays pretty well in G or D, as well - though your melody picking may be a bit more of a reach.