Lookouts, sentries, and guard-duty

[Scythe13]

Do you plan on this, and if so, how have you figured it to work?

What amounts of people would it take, how much watch would you have, how have you figured people will remain active, what size shifts do you expect people to work, how heavily manned do you plan your lookouts to be, how heavily fortified, what kind of coverage?

There is so much thought that needs to go into having a working overwatch system, what sticking points have you thought about and what work-arounds have you got?