As for flex and durability, it has been designed to flex in certain directions based on the likelihood of impacts. So if you were to pick it up off the car, it would feel very stiff and not have much flex at all. However when taking a hit from below, such as when it hits the ripple strip, the front of it has been designed to have a small amount of flex to transfer stress to the crash box on the chassis. Of course I couldn't possibly account for every possible impact scenario, so while it may be tougher in one type of impact, it is possibly less so in another type. This will be an evolving design, so if it were to get damaged beyond repair in a certain situation then I will be looking at that and analysing why it happened and what can be done to prevent it again.