Checking out the KEY website I see they have announced a Big Boy to be offered after the SP AC project is completed. The Big Boy will be built by the same builder as the AC's so it's sure to be a winner in the detail department. As well as being correctly detailed it promises to be a good runner and user friendly should you have the need to work on it. I'm sure the price won't be for the faint of heart, but I feel it will be the Big Boy to judge all other Big Boys by.
Butch