thanks guys, lots of insight.
I'm going to start another parallel thread, with a more focused subject, as i believe this could be a help to me and others. It will center on only lightweight, 2 walls, 2 person worthy, windstorm worthy trekking pole shelters.
But this thread is a good place to continue discussing the finer details.
I'll ad to the discussion here myself:
Anybody have had good experience with a 2 person inner for the trailstar? I'm specifically thinking about the situation where fierce, driving rain changes direction directly toward the opening. I can see this not being a problem when using it as a solo shelter with a bivi bag. Do you just drop the opening?