A legend is on its way to Trainz - Pennsylvania Railroads X23 Boxcar. Created with the most realistic detail and materials (yeah that's still good old TBumpEnv ) it will be shortly available with different skins and materials.
Your modeling skills are quite impressive, but your attention to details I find somewhat lacking, especially for payware. Are you sure the siding on this car is properly oriented. The original 1912 car diagram shows the siding vertical. Later versions show the siding horizontal as you have, but on those cars, the horizontal bracing between the diagonal and vertical bracing was not used. These horizontal braces were used only when the siding was mounted vertical.