This kind of feels like a joke post because the hulls are barely big enough to support 170 pounds. i remember seeing aqua cats on the race course in the 60's in Miami.
There are aluminum poles instead of shrouds and the mast is all the way forward. You would need to tie a line, maybe 7' long, to each of the "shrouds" and loop it around stuff or bungee it down some how.
You would need to make sure the 3 poles, mast and shrouds, are sealed.
It would not be unusual for the sail to flap violently in a breeze with the sail let out to the end since it is not fully battened.