I will most whole-heartedly agree with not restricting yourself to a run squared with the coop. Because we were space limited, and the only place to put our setup would have put a straight-from-the-coop run smack dab over Ken's prize apricot tree, we had to think outside the box a bit. So we offset the run, built a short box between the opening to the run from the coop, and we have been so happy with it.
One thing I would add, too, is what you touched on in your initial post. You are right to think of your convenience as well as what's most comfortable for the chickens. Our first design was a raised coop contained within a huge run. I'm so glad we opted for a shed type coop now. We're in our 60s and it's just a little tough to try to get under a raised coop to rescue an injured chicken, retrieve eggs they may have decided to lay there, and clean poop out from under it while crouched. Um, I don't do crouch well. So we built it so that we can both stand upright.
The tunnel box...blocks drafts from the north, shields the opening to the coop and run from predators, and allowed us to put the run in a totally different orientation.
Rather than come right off the run in a straight line, our run had to sit beside and in front of the south edge of the coop. By golly, it worked!
You are smart to pre-plan. Paper, pencils and erasers are way cheaper than wood and wire! Good luck with your build. As @aart said, there are lots of designs and builds in the forums...peruse to your heart's content, and steal ....um....borrow the most workable parts and pieces of the various setups, or even copy the entire thing. Whatever works for you is perfect! My Coop link, under my avatar, will take you to my build. (Don't tell anybody, but when we were designing ours, anytime I'd see a post with that little blue "My Coop" under the name of the poster, I'd click on it and go visit, even if we were actually discussing broken eggs in the thread! Shhh....our secret!)
And welcome to BYC! Glad to have you!
Edited by Blooie - 1/29/16 at 7:29pm