To answer your question, no, we do not have that kind of resources, all of our codebase is kept private within the dev team member.
However, it ultimately doesn't matter, our codebase is just too big for someone to know everything, you can get familiar with it, but it takes a lot of time. Its something you learn to work with little by little.
Also, while its not meant to discourage you, but if you don't have a background in coding or have never really done much coding before, you might find that coding a new system from scratch, fixing existing or adapting them to be extremely challenging.
If you want to talk about it, you can reach to me on discord.