The truth is that the golden arrow was a bit of a hack job on my part.
The main factors were as follows:
-making it compatible with the existing tires so that the new tires would also be compatible with the old cars
-making sure the already sculpted drivers would fit, a bit of a challenge as the arrow has a very narrow driver area (not unexpected for a land speed vehicle)
-Castability of the parts, with the intent of keeping the price reasonable.
-Modularity for future variants