Yay!! A bustle! I'm excited :D
I don't think you need to pipe the seams, but the 1870s loved trim, so if you want to go for it. But if you don't then leave it off.
I think it would be pretty snazzy with contrast piping, ooh... or black and white stripe that was cut on the bias... but without will look nice, too.
Love that bodice.
Man, now I want to make a bustle gown :o