if it were mine, i'd go with a rod with very minimal finials. go to the corner on the left window, match distance on the right side of the left window. do that same distance on the left side of the right window.

you can get a corner bracket for the window/s on the right, so it would look like a single rod making the corner, countrycurtains.com sells them.

what with the different sized windows, not centered on the angled ceiling... (and none of that is bad or wrong, just is) i think to have different amounts of rod extending beyond the various windows would just add mayhem.