Oh I am so glad you think they are worth thinking about. I was worried you would think I was being presumptuous by doing that (and yes, red is for clarity of mark-up not angry)!
I don't think Option B is the best because of the match-up at the front (I think the row house look rather than the attempt to perfectly align at the front is going to be a better look), but even if you don't have 4 feet you can stop short of the grape vine and dog-leg into the back run on the side.
Also, I picked 4' because it is half a standard lumber length and roomy enough for 2 chickens to roost - but of course you can always make it 3' and just have more waste.