I too , like Prism99, have a voyager with a 17"harp. Most of my quilting is done on bed size quilts. I can comfortably quilt a queen side to side but when I get to the bottom the quilting space is diminished by the size of the roll.
I just looked at the link that Prism99 listed - looks like a nicely made frame. If you are not working on bed size quilts it may work nicely for you. Good luck with your decision.