Both major and minor changes to the design made it quite exciting to see if the shawl would look anything like what I had in mind! It actually does, so I'm happy with my modifications:
1) adding three small groups of holes near the top of each triangle;
3) the edging I "designed" (sounds fancy!) to frame three sides of the shawl; the points are formed by increases and decreases, their width based on the number of stitches in the repeats; I used yarn-over increases to make groups of holes for decoration and to make the edging elastic. (I tried invisible increases first, but I thought that made the edging look too solid compared to the rest of the shawl; it seemed too tight too.)
4) adding a knitted-on border, basically "Mrs. Hope's Vandyke edging" (also in Victorian Lace Today) except I skipped two rows (15-16) to make it match the number of stitches picked up along the edge.
It's ca 120 cm (47 in) wide and very light, ca 120 grams (1/4 lb). Eva hasn't seen the finished shawl yet; those who have tried it on say they like the shape, since it doesn't slide off the shoulders the way a triangular shawl easily does. However, it keeps your arms free rather than covered, so if you want a shawl to keep your arms warm this might not be the best choice.