There was more yarn than I expected, so I ended with a few pattern rows with extra increases for more pronounced points. I'm pleased with the edge (I wanted something airy to balance the fairly compact main pattern) although I think the original design is prettier.
That goes for the whole shawl, by the way, even though I'm happy with my modifications - and even happier that I've left my old fear of experimenting and taking liberties with patterns behind. I've learnt a lot (and still do) from following instructions, but it's nice not to have to depend on them all the time.

1. Variation star motif used. It's bigger, so I made this shawl five stars wide instead of seven.
2. Garter-stitch border skipped.
3. Centre "grid" pattern resized to blend with the stars, and I added different groups of nupps to it.
4. Edge knitted on instead of made separately and sewn on. (Which keeps this from being a real Haapsalu shawl, but I guess it's safe to call it Haapsalu-ish!)
The finished shawl measures ca 115x105 cm (45x41 in).