Marty - very nice. I really like the motorman in the front - that adds so much to the realism of the model, especially with the well-executed clear Corgi windshield.
How did you remove the floor from the Corgi model? I have not figured out how to do that without damaging the carbody.
As far as scale goes, 1/50 is only 4% smaller than 1/48. That's imperceptible to most people, I suspect.