It is not really that hard to achieve simply we do not have any props for that, and even if we can do it single picture in 3d is kinda worthless, you need to be able to create entire series, and doing a photomanipulation for every picture is plain insanity.
You can see my results, here. the main problem was to decide how exactly it should look like because realistic eviscerations are not that cool as 2d pictures.


There is no need for photomanipulation because you can just stick that gut picture to your model and make it kinda look same. it is even possible to make some kind of 3d texture but to do that we need good pictures of guts.
So if you have good pictures you use for photomanipulations you could share them here and they can be used directly on 3d models as iray decals. for better results, we also need a normal map and transparency map.

the problem with those 2d stickers is that all pictures look exactly the same and you cannot even show progress. the same situation with blood because if you add some blood it will stay stationary forever.

the more advanced method is to use a posable tube for guts but we kinda need a good texture for that tube
another piece we need is the wound itself. especially the edges of the wound.

Of course, if you are willing to edit existing pictures that's great, but also if possible please post pictures you used for editing.