maurice wrote:
(snip)

Am I asking for trouble if, at this point, I simply drywall the two
original walls first, then drywall the inside of the angled wall? I'm
thinking that will only leave about 1 inch of unsupported drywall.

It won't be a problem for the inside corner. You will, however, want to
make sure you have solid backing behind the drywall on the outside corner.