I have a 14 squared and it is over fourteen feet and does indeed have 14 suare metres of sail. It is a great little one sail boat but nothing like as race tuned as the Taipan 4.9 which I also have.
The 14sq is a boomless rig and very simple to sail. The inhaul and downhaul are used to resist rotation and there is a positive rotation device for running.
The mast essentially finds its own place. Not as easy to tack as the Taipan or a jib run boat. The 16 square is a very similar boat to look at but has 16 square metres of sail and is 16 feet long and the sailors say it has more boyancy up front. It would suit the weight of the chap who asked the question and deliver a great ride.
These Nacaras are true beach boats and excellent recreacion, tough and fast.
I believe they can be beefed up with the Nacra foil and hooter.