For using CBSD on a new machine you need to have internet, else you need to copy /usr/src to /path/src/<freebsd-version>/src, and compile.
Some users prefer to avoid compiling and use what is built.
Provide a provision like ezjail-admin where you can use the freebsd-dist directory from a location, which has doc.txz, kernel.txz, ports.txz, base.txz, games.txz, lib32.txz, src.txz.
With an optical disk it would be like following to create a base jail:
Hi! Thanks for feedback.
This ticket is interesting because it is the second one: https://github.com/olevole/cbsd/issues/52
I probably make possible to obtain a minimum base of working copy (ie, from / environment) in the next version of CBSD.