Interesting...

So I was curious how much of an offset there would be between the old and new wall.



There's no way I'm going to be able to be able to hide a quarter inch drop with just joint compound. (At least, not without adding a quarter inch of compound to the entire new face.)



To top it off, the gap widens as it goes out.



I sort of expected that actually. A slightly angled wall probably won't be noticeable.... but since I may have to move the wall to close the gap, I suppose I could try to straighten it at the same time. Fortunately, I used screws instead of nails, so it shouldn't be too hard to partially disassemble the structure and shift it over a little.