I think I stopped so close to the finish line because it didn't fit as illustrated (see below) and the closer fit didn't suit my 80s sensibilities. I could probably block it a bit bigger, but now the fit seems just fine.
I inspected it with the benefit of additional decades of life (if not knitting) experience during which time I have become far more picky.
I am impressed by the knitting. My tension was great and the floats on the back are nice and relaxed.
However, I did a bad job on the assembly.
I wouldn't choose these colours if I was starting this project today, but methinks I'll resew it to meet current quality control standards chez The Sewing Lawyer, and finish it (finally).
The pattern is "A sleeveless cardigan for Sir or Madam" from The Man's Knitting Book - classic patterns from the '20s to the '50s by Jane Waller, now out of print. If you come across it, it's a really nice collection.
This pattern is from the roaring '20s.