I have the Pinnacle (all metal) ... so, about the best I can tell you is that the Grace company provides a good service ... if you can get that frame for less than what the link showed, you will have made yourself a great step up to completely quilted quilts for the first one.
The fact that someone has a Bailey 15 inch machine on it, suggests that perhaps it will upgrade to a mid-arm (18")?
if that is the case, that option is an added benefit.
Now, I am all atwitter to find out how you make out on the auction and what you actually end up paying for it! <wave>