This a drawing of one half of the rail. Even thought it is slanted to go up the stairs it is symmetrical about the center. By drawing one half of it I am able to determine the shapes of all the scrolls.
Here the frame and the first scrolls have been
assembled on the table. The railing is much longer
than my table, so the protruding end is supported
by sawhorses. I checked (and corrected) each
piece of the frame for straightness and twist. I
level the frame using small steel wedges so that it
is all in one plane.