If you were a fan like me of editing body lenght / torso etc you will notice that that option is no longer available in 2k18; well I think we can change that since seems 2k has moved those parameters inside the PNG file
So open the desired PNG file with 7-zip and look for appearance_info.RDAT:

So for example below I exchanged parameters of Durant Body into Lebron...et voila! We've changed body proportions!


That's great for modding perspective becouse modder not only can edit the 3d but also release correct body proportions..also I think you can change more than just leg / torso / shoulder size
Hope this help !