disclaimer- this is an old worn out stained body, I wouldn't exactly do this to a good doll
I wrapped his parts in fabric, plastic wrap or foil will work too, then in duck tape. After that I marked key places with a sharpie and cut him out of the tape along a seam line. The next step will be to make the least needed cuts to make a fabric pattern ala the fabric ball joint doll
viewtopic.php?f=15&t=13371 and see what happens.
This would also work for making patterns for a Yoshida method.