Sorry, I don't own a Catalina 42. I have been involved in manufacturing of Catalina, Beneteau, Jeanneau & Hunter and I know as a fact that if you need to add stowage, tank etc, it can be done.
If you called the owner of Catalina, he will say that his Catalina 42 can sail around the world but he will worry about the person at the wheel more than the boat.
Quit you whinning. you just upset that you paid too much money for a boat that has the same building techniques as Catalina etc.