If you've never been privy to this one its a old classic.
Less need such sage advice than perhaps we use to have, but still some good points if you're so inclined to take it. I know the doors on all the ones we built opened out and he makes a good point about them opening in to facilitate gettin some air while the business is goin on. The main downside to that is that you need to make the whole assembly a bit larger. We delt with it by fastening a string on the door so's you could hang onto it incase you saw someone heading your way.