There are instances when a GUI file manager just won't work. When I run into those situations, I have several terminal-based options.
There are other home server, NAS, and media-streaming distros, but this aspires to much more Hands On Want to get off someone ...
To edit the build parameters, modify the ./src/args.sh file. That's it. The built file will be an ISO file in the ./src/dist directory. Simply mount the built ISO file to an virtual machine, and you ...
There's an OS for everyone (and every task).