Here, you can see my S99Local file which adds users and groups from /opt/etc to the main password database. I gave the users their own id and group.I also moved the local user's home directory from /opt to /mnt/home so they could use Samba and the larger filesystem. I used smbpasswd -a to add the users to /opt/etc/smbpasswd.
Proftp and Samba enable anonymous write permission to /mnt/public. This is so the guests who come over can have access to the share volume and transfer data without using sneaker net. The Proftp config file is modified to allow guests to write the public share. I enabled the firewall to allow guests to have FTP and SMB access from the guest LAN.