Not sure I would hire you. Nope, don't think I would. Hell I might even cut the interview short so I can move on to the next candidate.
Now that I got that out of my system you mention nothing of configuring your router to forward the appropriate FTP ports to your 'server'; in this case the G3.
To access the files from the internet you will need the following:
1. The outside IP address of your router. If you have a dynamic IP I would recommend a service like dynDNS.com
2. The corresponding ports forwarded through the router to the machine in question. FTP uses port 21 so you would need to forward that port to the G3.
I have a question. Since FTP passes the username and password in plain text, and is generally not the most secure thing out there, why did you choose FTP over SSH? You can use WinSCP and PuTTY on a USB key through portable apps.