Here is my version.
The only change I made was to increase the number of buttons from 6 to 7. The pattern markings are for size 36 and it tells you to alter the top placement according to your size and to leave the bottom button placement where it is, then evenly space the other buttons between the top and bottom. As I made size 42, if I evenly spaced the remaining buttons there would be 3 7/8" apart which I felt was too wide. When I increased it to 7 buttons, the space reduced to 3 1/4".
The other issue with the buttons is to do with size. The pattern says to use small buttons, you really need to use the smallest you can find. As the buttons are underneath the band, the buttons have to fit within the stitched seam lines, One of my buttonholes was ever so slightly to the side, which in normal buttonholes wouldn't have mattered, however trying to put the button in is very fiddly as the edges of the button are right up against the stitched line. If I make it again I would be tempted to make ordinary buttonholes, apart from that one wonky buttonhole, the buttons are fiddly for fastening.
I like the outcome of this top. I plan to make the dress version in a floral poplin with plain contrasting colours for the plastron.
On to other things. I actually finished this Hardanger piece a couple of months ago, but forgot to post. About a year in the making. The base fabric is a light purple, I wish I could remember what fabric I used and the count. If I remember I'll add to this post.