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(Continued here because posting to the other thread fails.)
You may! I feel kind of honoured to be dubbed something because I've always posted anonymously to imageboards.
The script was generated from scratch but it's no accident that it looks similar to Kareha, as I'm avoiding any Javascript for this project. It got this look simply by telling Grok to use the Yotsuba theme. It immediately nailed it.
I've only seen Kareha configured as a textboard. It's used on 4-ch.net. A thread list is almost unique to Nekochan but Kareha is actually one of the few that shares that functionality. But nobody else has implemented nested replies in an imageboard script to my knowledge and Kareha also lacks user-created boards. They're both Javascript-free. Kareha has selectable themes and pagination even inside threads.
It would've probably been better to start with an existing script and extending it because right now I have to implement basic functionality, but now I have this script and I don't want to abandon it. I'll continue working on Nekochan a bit more, and later fork another script and extend it to include the same functionality.