Details regarding the purchase, cost and process can be found at the Keystone Details product page. An interior detail kit is also available separately for purchase here.
Wow, what a cool idea for a model! Stillwells were used by many roads and remained in service for generations it seems. A bunch remain in service on tourist and museum lines.
Decals are now available for this car from Prime Mover Decals, here. Image copyright Prime Mover Decals: