Given the actual client brief that makes much more sense

I didn't know that about the gopro's, makes sense as could end up causing fair bit of damage

Sounds like you've learnt lots for the next one which is the main thing!
Also how about having the credits as something more dynamic other than just black?
You could have the old ken burns of stills of his car in the background or time lapse of the crew packing up.
Also with the number of videos you're knocking out, how about a DH presents intro clip or DH productions etc as a lead in, more exposure for yourself and great for if people embed / steal the video.