Don't know whether Wismer Machine Co (Sellersville, PA) are still in business, but they did a castings kit for a 1/2 scale model of the International M. Back in 2009 the kit sold for $600. The original design was from Bruce Moyer.
Just looked and they are still in business. The models were a sideline but are they are still sidelining?
Dave
The Emerald Isle