Eventually I'd like to move the site to open source, but right now the repo isn't in a place where I can do that. As for specific parts, it's pretty purpose built and this is my first Rust project and so I'm not sure which parts would be helpful to the community. And I doubt they would meet the communities standards just yet :)
It’s better to open source sooner rather than later even if it’s not in a place you’d want it to be. Like some of the work you have to do might be done by the community.