I am working on my own level set. This can be cloned from GitLab here and placed in

/home/user/.rocksndiamonds/levels/user

Your own levels will be in /home/user/.rocksndiamonds/levels/yourusername

So once you git clone the repository then place the levels in something such as

/home/user/.rocksndiamonds/levels/customlev

for example

#rocksndiamonds,#levelset