BH, colour really is such a personal choice and the temptation to go the bespoke route is always a strong one when ordering a new Morgan.
My advice would be to take a look at the colour sample threads:
Morgan Aero colour samples and
Traditional Morgan colour samples as a start.
If you want to reference the historic nature of the Moran 3 Wheeler, it would make sense to go for a non-metallic paint, as would have been found on the original three wheelers.
Personally, while I haven't seen the 3-Wheeler in Sport Red, I have seen the Pedal Car in it, and it looked superb.
