So there I was with problem number one
Notice the nice 90º turn? The intelligent use of the double increase? I thought not.
Much better, sweater now clicking along.
I finish the first front (and you can clearly see why my first attempt didn't work)
I knit the second front and started on the back extension. Reaching for another ball of yarn, I discovered a slightly disconcerting problem - only two balls of yarn left (actually three when I get attempt #1 frogged). Serious issue - If each front plus side extension takes four balls of yarn and I have two left - what are the chances I can get the whole upper back out of what I have left?
(more pain and the rest of the story here.