BG - Navatek spent years and millions of dollars studying the 21 and 25. I know you've been talking about the unicorn trailerable 21/23 for a full decade now. People with unlimited resources, teams of high level engineers with years of education and experience have set out to achieve the same desired goal. You might want learn who they are and understand the lessons they learned before you set out on your own quest. You're not going to shoot from the hip with zero skills using someone elses money and nail the design.
Someone is already splashing the original 21 hull making a mold.
If you want a good looking design on very functional hull . . . take a look at 20 seafari cabin on the original 21 hull. This is Carl Moesly's daughter Carla mocking it up.