Your competition may well be MTH - they are all metal, and apparently they have lengthened the wheelbase and made them look like real passenger car trucks. I think they are over $20/ pair?
Any word from OK on whether the original Kasiner bodies are available?
I have a fluted Kasiner car that had all the flutes removed - not by me - and you almost cannot tell. I took a K-Line SP Obs and removed one flute above the windows, making the windows more like the Daylight windows. Kind of a waste of time, since the flutes were " outies" and the Daylight cars are really "innies" - but it did look better.