>>8168657Something quite severe that I forgot to mention which already bothered me during the construction of the mech and LDD pretty much confirmed my suspicions:
There's an illegal connection going on at the hip joints.
Those large Technic ratchet joints have a slight curve at the point where the Technic bar goes over into the ratchet part so the part at that point isn't flat.
However, that didn't bother the designers and LDD where the part on top clips right through the curve so the piece doesn't actually fit properly.