With the way I've glued it, to the butt, it keeps the butt flush with the kidney, which automatically stops it from overlapping on top of the kidney. Can only speak for how that's worked for me, but I totally trust everything Glen says (costume wise at least [emoji6]). I made my tabs quite long, but probably could have made them shorter, as I don't feel like they're under a lot of stress. I used superglue / CA, and it's holding fine so far.