Originally Posted by Cubdriver

Not trying to pour water on the design but they did not give any data on useful load and it would just have to be pretty small. No matter what it is, there will be a temptation to overload the airplane with all that space inside to fill. This means of course that it is likely to be crashed. Experience shows people are stupid enough to do this, especially in summer when such a design would appeal the most, and the large interior space adds to the problem.