It's not the exactly 1-5, but 1-4 you get for free with "Guest Session" in Ubuntu.
It might be a good starting point.
Here is a tutorial how to customize the guest session.
Q: can I test this from terminal before going live with the fstab
command line? if so, what's the syntax?
You can mount all the drives listed in the fstab file with the command
sudo mount -a
Unmount all of the drives listed in fstab with
sudo umount -a
Q: if the above line is incorrect, will it crash my ubuntu boot?
Probably not, but just in case, add it at the end of fstab and have a live USB system ready in case you need to change the fstab file from it.
Q: the credentials; the public area on my LAN-NAS doesnt have a
password/username requirement (I dont think) - is there a way to test
this with a terminal command line? if so, do I just put username=guest
password= (blank) in the credential file?
I think you should be able to remove the credentials part of the line completely. Otherwise, try creating a credentials file with empty user and password. If you try without the credentials and you get "permission error", your LAN-NAS does have password/username requirement.
If you are using Ubuntu 18.04 you might have to add vers=1.0 to your line, depending on the version running in your server. So your line would be:
//192.168.106.105/Public /media/nas cifs vers=1.0,uid=1000,gid=1000,credentials=/home/pseudo/.nascredentials,iocharset=utf8,sec=ntlm 0 0
Best Answer
If you are not behind a router, you can find it out using
ifconfig.If you are behind a router, then your computer will not know about the public IP address as the router does a network address translation. You could ask some website what your public IP address is using
curlorwgetand extract the information you need from it:or shorter