the body is just normal cushion or apolstry foam you get at any fabric store i use 1, and 2 inch foam and laminate or build up to an exaggerated siloutte of what i want then sculpt back..(same principle as the clay for the mask)..that foam for mask is different it is a chemical 2 part foam from smooth on products. i made the hulk head ( the body was a friends old couch..lol)with just average foam so if you dont have access to the smoothon you can stil go regular foam route just use thinner foam and build up. you can add detail with each level....the hulk head was made on a painters sock on a foam head from costume store. once foam carving is complete you can do a layer of veins which can be made with anything...foam noodle if you have it, shoe strings whatever..as long as it flexible, the foam noodling or foam piping is best i found.
after veins you do skin. a sheer stretchy fabric works best...i found this nice fabric in a bin have no clue what it is but works great. its textured with lines like that of muscle fibers and i use that to good effect for the illusion of muscle striations ( my pics suck but it looks and feels like skin)you can apply the fabric with sprau glue then pin before latexing. you can fold and shape fabric to create skin folds etc....about 2 layers of tinted base latex (acylic paint in latex) then i start painting. you have to use latex in the all the paint . i airbrush the final highlights without . the end result is a tough realistic lookig and feeling skin. im still working on my method but this is what i have so far as its working well.
heres my deviant art link theres some more making off pics there that may help
mongrelman's deviantART gallery
and my youtube channel that has the vids all in one area that show process i used.
https://www.youtube.com/user/JimminyCreepers/feed?activity_view=3
they should help get you moving..you will notice the sketches of costume vary from end product...they are just to get you going and give you focus the costume will reveal itself and often way better as you do it.
later