It should also be noted, that all those ships weren't designed to operate together at all. They have different design, different tactical purpose, different speed and weaponry. To compose a squadron out of them would be an utter pain even for tactical competent officers - and Confederacy Navy wasn't especially competent in therms of fleet action (actually, they were almost completely incompetent in this matters - almost every time they tried to operate any significant number of ships, it ends with horrible mess).
Also, most of those ships would not be completed till at least 1864, most likely - 1865. At this point, they literally could change nothing; Union fleet have enough numerical superiority to simply destroy them, even if - somehow - they would be adequately handled.