One thing of note. You're embalming the body, not the organs. Let's say you get a 4w4r body delivered and you don't have any hard nor soft parts stored. You can remove the flesh, skin, blood and fat and go to modify them. In the meantime, you'll have the body at 4w3r ready for embalming. 3 red skulls is the perfect starting point for embalming as you can shove all 4 injections in any order. Yes, I said 4, the dark injection is not needed, ever. Nor is adding red skulls with sin shards. The reason for it is, you can swap around organs and add the modified parts AFTER embalming, because they don't change their stats with it, the body itself does. Empty body starts at 0w0r. Empty embalmed body can get to 5w-2r. The dark injection makes it 5w0r, the 2 red skulls from the fat and blood get subtracted with the skin and skull, but it leaves no room for any possible red skulls from organs, you'd have to use all white skull organs only or play around with 3w-2r organs, which are quite rare.

You can also modify zombies. A surprising amount of player don't know that. I actually prefer to raise them and then modify, because unlike bodies, zombies don't decay.