Sadly. honesty is a rapidly fading concept and, indeed, the honest person is generally regarded as a "mug" these days. Which (sadly again) means that you have to work on the principle that even the most reasonable seeming person is out to rook you. I don't see why you should be a single penny out of pocket because of his stupidity, so sue the ****** (insert expletive of choice0 for the full amount of the repairs. Sounds like you hold all the aces though; independent witnesses are crucial, so I'm sure you will get the judgement in your favour. Bloody well hope so!
As for cyclists generally, well, I drive a van as part of my job, and there's not a single day that I don't see them riding on pavements, going through red lights, weaving in and out of traffic and trying to squeeze through non-existent gaps. And then they have the nerve to claim some sort of moral superiority??....bastards, Anyway, all the best of luck. Don't give up. :luck: