Brett, I only thought there was only 1 out there. Apparently this is #2. Some people like them better, some don't. Black Thunder will build you anything you want.
The 43 non step and the 43 twin step are 2 different molds. The twin step also has more freeboard.
The 460 was a complete redesign with a CNC'd mold. If I'm not mistaken, I believe it had a bit more freeboard, the deck was a bit taller, the nose is more aero, and the back of the deck was changed.