If we are already considering creating sub-modules, it may be a good time to consider splitting the code into top-level modules. These top-level modules can be put together as separate Julia packages. 

Let's take a look at the benefits and potential issues for making new top-level modules:

The benefits of having separate top-level modules are as follows:

• Each package can have its own release life cycle and version. It is possible to make changes to a package and release only that portion.
• Version compatibility is enforced by Julia's Pkg system. A new version of the package may be released, and it may be used by another package as long as the package versions are compatible.
• Packages are more reusable because they can be utilized by other applications.

Potential issues with top-level modules are as follows:

• There is more management overhead because each package will be maintained and released independently.
• Deployment may be more difficult since multiple packages have to be installed and inter dependent packages must obey version compatibility requirements.