The concept would mimic that of the Santa Fe Super Chief cars released some years ago. There would be one set that could build one car with extra pieces to make various interior and exterior modifications.
Still toying with whether 'new dark red' or 'bright red' would be better for the window panes. The blue is 'medium blue', which I'm hoping is the same blue from Pet Shop. This is still somewhat of a work in progress, so suggestions will be considered for revisions if necessary.