I finally finished altering my tiny pocket tank to accommodate seven inches of difference between my full and high bust measurements. It involved a few mishaps, but seems to have worked out in the end.
See those red lines? They make up the GIANT dart I needed for a two inch FBA (my first!). My pattern looks a bit like Frankenstein's monster at the moment, and I'm a little nervous about cutting into my fabric with it. Luckily my test run is some $2/yd poly/cotton I bought heaps of.
I'm a little behind on my challenge, so I'd better get stitching!