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Do the nest boxes need to be 18" square for each hen, or is that for a communal box?  We have 6 hens, (except we are wondering if our Buff Orpington might be a rooster) I've read that you should have 2 boxes per 3 hens, is that right?  Thanks for all the help.
that's what they say but all my hens use one box anyway so I took the second box out... it was taking up space.   FYI they dont have to be square, round is okay too,  like someone said above.. they use buckets turned on their sides.  Basically big enough for your biggest hen to get into is what you need. 
Nancy
These are all great ideas.  When I read back what I had written, I meant to say 1 box per every 3 birds, ...so for my 6 hens it would be 2 boxes.  It sounds like almost anything will do, just so long as it fits the largest hen.  Unless the Buff turns out to be a Roo, I am assuming the Buff will be the largest hen or the Barred Rock, they seem to be the largest so far.