dblgnfix
If you check the website for Ernst Apel Wuerzburg (EAW) or Recknagel ( ERA), you will find schematics. You should note that none of them depend on the rib to hold the mounts. Except for the very rear part of the rib(which is hard soldered, you can likely see the joint) it is soft soldered to the barrel and would not stand up to the stress of the weight of the scope under recoil. There are a few people here that can do the work, but are expensive.
Mike