We have the three cabin layout and three crew members (aka, the kids). Thomas, 7, Sophie, 4 and Matthew, who is 1. It would be nice to give them each their own 'space'. Each aft cabin is cavernous, so one option would be to split one of the doubles in half, in the way with did with our Albin Ballads for-peak.
The other alternative is to create some way of creating a cabin in the main saloon with a lee cloth for the littlest.
Option 1 - segment one of the aft cabins:
More details of Mirage here now:
http://www.sailingmirage.uk/about-mirage/Option 2 - get a roll up topper for the mail saloon chairs: