Maybe not quite what you are looking for, but I made a site using the (Arc) HN code that is about retro-computing and gaming: https://twostopbits.com/news
Not really. I had a harder time implementing new functionality (e.g. Two Stop Bits allows tags to be associated with a story: https://twostopbits.com/tags). In the past I'd done a bunch of Common Lisp stuff so was just a question of remembering that and dealing with the Arc syntax.