I would agree a Hudson would be a natural. As long as all new tooling would be needed, charge a couple of bucks extra for wire handrails if necessary. The cast on ones on the Berks look, well, cheap. Heck, even most of the LionChief Plus O gauge steamers have wire handrails.
We all know Lionel can do it.
This is the 21st century after all...
Rusty