This mod looks amazing! I really want to try it out, but I feel like the salmon ladder is pretty much impossible.
See the problem is that in toribash, all joints are hing joints, and what makes the salmon ladder possible is the fact that human shoulders are ball joints. (don't know if these are the technical terms, but its what they are called in robotics) This makes them able to rotate a full 180 degrees around the joint, which makes it so you're able to position your elbows in front of your face vertically, and that is the position needed for a pull-up/muscle-up (which are the motions needed for the salmon ladder.)
So unless you're able to fix this, or someone finds a different way to do the salmon ladder (maybe use your legs? the knees contract similar to elbows, but the legs are vertical instead of horizontal) it's going to be impossible.