The Princess asked for a few things - she specified a pattern and asked that the shawl be huge. I knit my shawl which was also round, to work out construction and bought the Elizabeth Zimmerman book to figure out Pi Shawl construction. I also reached out to the Jared Flood team to see if there was a way to make it even bigger. Oh and I stalked each and every girasole made on Ravelry and read the notes for everyone who made theirs bigger.
I knit the center exactly as written. There really was no way to increase in the center. I knit as many extra repeats of Chart E as I could, knit 3 repeats of Chart F, then I knit as many increases of Chart G as I could until I had to repeat again. Then I knit 3 repeats of Chart H and honestly I was worried I was going to run out of yarn. The Princess was home in late August and I had her choose between the edging pattern called for in the pattern, or the same edging used on all the bridesmaids' shawls. She (of course) chose the matching edging - of course it was the more difficult and complex edging. I think there was 1600 stitches around in the last 18 rounds. The edging took 2 rows to bind off a single stitch. I honestly thought I was going to the wedding nekkid because I did not start my dress until this shawl was finished!
Once the shawl was completely finished - the decision was made not to block it. Blocking would open the lace up in the center a lot more, but as you can see when the shawl is draped over my coffee table - the sunflower in the center stands out. The shawl is quite large without being blocked - The Princess is almost 5'11" and folded in half, the shawl stretches from finger tip to finger tip and hangs down past her knees. What was done instead of blocking was the edging was just steamed out to open it up without really making it any bigger.
I think The Princess liked it and it was exactly what she wanted. I don't know how she'll use it from her on out - but I expect to someday get a photo of a baby wrapped in this shawl.