Unfortunately the number of modern (i.e., post-1900) civilian ships available in kit form from the styrene kit manufacturers can just about be counted on your fingers and toes. This is arguably the biggest gap in the whole genre of plastic ship modeling. The resin companies offer a few more, but not many.
My guess is that your only real hope of finding a ferry kit of any sort is in the realm of the paper, or card, models. We had a rather interesting discussion of those kits just a couple of days ago here in the Forum. If you aren't familiar with them - don't dismiss the idea before you see what potential it has. Some of those kits are incredibly sophisticated and detailed, and they cover the civilian ship world much more thoroughly than anybody else does. I personally don't know enough about them to offer any practical suggestions for finding a particular subject, but a web search on "Card Models" or "Paper Models" would be a good way to start.
If you're interested in small-scale, pre-built models, there's a reasonable chance of finding one that would fit the bill among the vast 1/1200 and 1/1250 ranges produced in Europe. I don't know much about them either, but here's a link that should at least point you in the right direction: http://www.steelnavy.com/1250home.htm .
Maybe some other Forum member who's more familiar than I am with these segments of the hobby can offer more help. Good luck.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.