I've sold finished models on a few occasions, so I guess I can chime in here.
I wouldn't worry about the licensing issue, especially a small-scale "manufacturer."
I've never included a disclaimer, but ones others have suggested might not be a bad idea.
I sell my models on a well-known online auction site, and I've shipped them all over the world without damage. Of course I'm the one packing them, and much of the time I include unpacking instructions just inside the box, so the new owner can retrieve his model from the packing material without damaging it in the process. I also insist on shipping insurance, and should something happen, I suspect cash will go a long way toward covering the pain of the loss.
Big online sites open your models up to the biggest markets, too. I sold a McLaren model to a McLaren collector who wanted a professionally built model to add to his memorabilia collection. He wasn't a modeler, but was willing to pay someone who was for a one-of-a-kind model. Don't undersell yourself by setting your "buy it now" price (or opening bid, etc.) too low. You'd be surprised what some collectors are willing to pay. If a collector's used to paying several thousand dollars for full-size cars (or aircraft, etc.) paying several hundred dollars for a hand-built model may seem to him like a bargain! The McLaren sale paid for a new washer and dryer, which greatly pleased the missus!
Good luck!
Matt Usher @ FSM