I've got a b-line as well with a Juki 98. There is a small discussion here
http://www.quiltingboard.com/main-f1...e-t123344.html and a couple people mention using a HQ16 on the frame.
The company did make a b-line 18" machine to use with the frame before they went out of business, I heard because of health reasons. If you google b-line 18 a couple of photos will come up.
I've considered putting a larger machine on the frame if I could find a good deal. My only concern would be the rails the carriage sits on because they are that hard plastic material. If it goes I don't know what I could use to replace it.