IF you haven't found Viper Scale Racing yet---DO IT! Dan Cronin has the BEST engineered and finest HO cars available on the planet now! Check out the "Racing to The Future thread on the drag racing track he built for a school in Kentucky. That's a testament to his engineering and building capabilities. He's got customer tracks and stock designs in routed HO Tracks that are second to none! If you're looking for HO cars/ tracks/ track designer---look up Viper Scale Racing.
He can also do 1/32 custom tracks as well. All routed CNC machine with unbelievable quality for the money! If you're thinking of a home track--contact Dan!