Here's a picture of my second attempt at a shoulder join: vertical lines and a three-needle bind-off, which is my favourite method. You can also see the sleeve cap in this picture.
My first attempt ended with diagonal lines and a simple neck opening (and short rows for it to be lower in front). I though it would work with the horizontal pattern borders, but didn't like the way it turned out, thinking it looked just like a slit - as if I'd simply cut it open. The new neck looks more finished. The vertical lines blend with the ones on the yoke.
I'm sure I will associate this project with quite a lot of live music, completely different genres and completely different venues. First, there was first-class jazz outdoors surrounded by palm trees: Dee Dee Bridgewater in top shape (beyond words) and a quintet to match her dynamics. I'm still high after more than a week! Then there was The Ukulele Orchestra of Great Britain visting a small and charming theatre in Uppsala, a highly musical and entertaining evening. Last but not least, in a couple of hours off to Uppsala cathedral to enjoy Händel's Messiah. (By the way, I don't knit during concerts - but on my way to them or while waiting for them to start!)