I know this isn't screen accurate and it's not for everyone. But I tried it out on a friends build and it works pretty good! I made a video that describes a "tab to slot" closure for the right side of the torso. This prevents the abdomen from becoming misaligned with the kidney. I think a few people have done something similar to this but I've never done it on one of my builds.  It's simply some scrap 2mm thick and plastic glued to the kidney side. It has a slight bend in the plastic along the