Great setup!I like 14x14x16...did you know that they stand up when the egg is actually emerging from the vent?
They need to feel 'safe'...curtains might help that, but think they are more for the keepers than the chickens.
They don't necessarily need 'dark' either.
ETA:I emulated the old metal round hole nest banks, because I like they way they look(childhood memory), but I also think the round entrances help with a more cave like feeling of 'safety'.
Fake eggs can help draw them to the nest, if another bird laid an egg-it must be safe here. They can also 'spread the love' by deterring them from all wanting to use the same nest.
Deep(4-6") front lip to hold eggs and bedding in, especially when they first start laying they will tear the nest up until they figure things out.
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