Rework existing 3D Models of Human along with its rig

We have existing rigged models of a male character and a female character in high details. Your job would be to: 1. Remove head from the 3D models while keeping the rig intact 2. Create an extra set of models with modifying the body and clothes to a slightly fat person. 3. Texture the clothes in details. 4. Skin texture with 4 shades. Files are in made in 3dsMax Output needs to be in FBX format Need to be very fast. Please send your existing work on human characters and its texturing.