Well I have sewn up the side seams on my top. I had high hopes that Hilda would model it while I fashioned the straps but it seems she's been wasting away. Darn it, she's at least a whole size smaller than I am.
So I had to wriggle into the strapless top myself and crochet foundation chain straps in situ. Turns out I need a larger chest to make this a good fit!
There is just too much spare fabric to make spaghetti straps feasible so it's back to the drawing board! I think I will have to make it into a proper vest as per the pattern after all. Drat.