Since I had never sewn one like this before (let alone create the pattern), the button placket was the most challenging part. I used this tutorial to draft and sew the one piece placket. And it only took one try!
I wrangled a rounded hem, adjusted the sleeve openings at the shoulder and, as usual, took in the sides to make it less boxy. In the end I love this top. LOVE IT. I can picture it getting as "well loved" as the original.
Okay, by request, I have added a photo of the side-by-side comparison!