I've gone ahead and made the project public on GitLab for anyone who is curious as to where I'm heading with this. https://gitlab.com/thrrgilag/clacks. I've still got some changes to make around branding and need to come up with some artwork, and probably sort out translations. My initial release will be essentially like fluffychat 13.3 with a new name and a few bug fixes included. The big focus will then be on integrated E2EE so the code base will start to diverge a lot.
I'll make a more broader announcement in the near future.