So I want to build an FreeBSD iso with hexedit preinstalled. I'm doing that to understand how to build custom iso's. I don't have so much idea about custom kernel build. I mean I don't know how can I do that. I take a look to GhostBSD-src and FreeBSD-src over github and see some tutorials to build them but still don't know how to make preinstalled packages on system. That would be awesome if I can get a terminal over iso and use pkg command or ports. So what I have to do?