Good points! I'll add those to the list above!

I like the idea of tarp pullouts. That's a great benefit. I am going to have to add that to my next tarp (which I'm planning now, hence the post!)

Also, I like the rolled seam thoughts. Makes sense that you could only do this on the side since if it were on the ridge it wouldn't work that way. Definitely going to have to do that too!

XXL, why would you put grosgrain into the roll? Am I understanding that correctly that you would roll it into the seam?