Oooo...the B-1 loaders don't get the $$ that a later L-12 loader would, due to lack of bucket hydro and down pressure, BUT...it should bring a few hundered bucks the way you describe. There is only 2 rear mounts for a B-1 loader, and a front bracket that can be easily fabricated. The Cessna pump is extremely rare, but something could be retrofitted to run off the front PTO. They use less than 2gpm.
There is a second version of that loader, the L-10, and that loader had the ability to quickly remove the loader from the subframe. If you have that version, and are missing the subframe components, you will have a harder sale. They can be fabricated, but it loses some of it's AC luster.
Ok...I think that was on ebay a few months back. I recognize the IH decals and the added hydro for the bucket. It is the second variety of the L-10 loader.
It's missing subframe pieces to fit an Allis, but that would be easy to build. The important dimensions are there. I know where there's one piece that needs...it connects to the tractor frame and bolts onto the L-shaped arms that protrude inward from below the lift cylinders pictured. Then, you'd just need to fab brackets back to the tranny plates. Do you have a tractor you intend to use it on?
I was lookin at the craigslist pics of it, and it looks like they widened the loader frame to accomodate another brand of tractor (IH?). The bucket looks the same as mine (32"), but my frame measures 27.5" on the inside.