The manufacturers explanation is as follows:
"We tried fitting lenses over the Aston Martin DBR1 but it did not look as good as without it because of optical effect and that they would be quite difficult to fit and would be very fragile. At this time, the MMK cars can be raced and crashed hard with little consequenses. Fitting clear lenses to the H/L would cause these to fly off easily and increase cost beyond what is acceptable for a hand-built car. So unless we find a better way to do it, we would rather leave them out. We considered offering separate vac-formings to be customer-fitted but it would increase cost too much."
I am myself a bit disappointed not to have such lenses fitted, but this is due to the vast difference between hand-cast resin bodies and expensive injection-molding. On one hand, you get cars that the major manufacturers will possibly never produce, on the other hand, you loose a bit in detail.
What to do, what to do.