Erm... yes a bit like Vessala, it's been a while since I looked over those rules!
I would have thought the point of honour was not about personal honour, but public perception: Everything we've seen in the show points to that! Yes personal honour is about the morals and ethics you are supposed to be upholding, and that requires no system, as it's all about roleplaying. Public honour is about others percieve you, how many warriors deeds you've done, how many battles of note you've won, which side you picked in a civil war and whether you shafted your own family in favour of doing the 'right thing' - these are the deeds which other Klingons would respect (or not) and therefore grant you any kind of social benefit.
For example, a 'scientist' may live by as high an ethical and moral code as any Klingon, because Klingons are SUPPOSED to do that, but unless he actually fought a battle, few would see his scientific accomplishments as worthy of great renown and honour.
On the flip side you could have one of the Duras Family who was a weasel and a toad, who backstabbed his way into influence and power, fabricaded all of the stories, and made anyone who had any evidence to the contrary 'dissapear'. He would have high 'honour' because Klingons percieve him as having such. And as soon as they realise it was all made up, he would loose all his honour and gain negative honour too, because he broke the Klingon code!