I use a 130 hub in an older 126 steel frame without issue, but I wouldn't want to have to do that with a new frame. I also have a 126 aluminum C'dale bike that I wanted to try, but that was a totally different beast and isn't recommended.
If this is an American retailer I'd have them take care of it for you one way or the other. If it were a Chinese seller then it would be a little harder. There are a lot of frames you can buy from China these days really cheap.