Recently I published initial version of my Osnowa framework on GitHub.
If you want to make a 7DRL and are somewhat familiar with Unity, but don't want to start from scratch, Osnowa can help you with stuff like tiles, turn management, field of view and ECS.
I'm offerring my support during the jam for up to developers using Osnowa (assuming you'll let me know first).
It's an early version, but with some guidance I think it may be useful (at least some parts of it).
Feel free to check out the docs on GitHub and send me a message if you're interested.