So if you're going to have minor bumps result in a repair bill more expensive than many cars, it's not that much of a stretch to say that'd make it virtually unrepairable.
Interesting! But may have actually not have been sealed.
The Wikipedia page says:
“ The bonnet was widely rumoured to be sealed – Car and Driver wrote: "...feature of the A2 that may foretell the future: the sealed hood". Actually, the bonnet is easily removed, being held in place by two twist-lock catches. The bonnet, weighing 8 kg, then comes away from the car altogether, unlike the usual hinged flip-up arrangement on most other cars. Due to the service hatch, the bonnet does not need to be removed frequently for access to the engine.”
So if you're going to have minor bumps result in a repair bill more expensive than many cars, it's not that much of a stretch to say that'd make it virtually unrepairable.