you are going through the same stages i went through. you wanted it all, then settled for less,then dropped the project. then you came back.....
...i plan to get my project done over the coarse of years now. it's too big like yours, and there is little that came before.
we have the same basic problem though. the legs. unlike my full size sentinel, which has room to move my legs up, and wide feet, you have nowhere to hide your feet when you make the porportions bigger overall.
im going to tell you now, you will not be comfortable with this thing on. no matter what. the best you can hope for is a movie quality look, and a fully functioning body(hands that can hold a can of soda, walk a stairway, etc).
i suggest going for a 10 foot build. and putting your feet at a angle. make a special footwear device that will hold your foot like a woman's 6 inch pump heel. at 10 feet tall, you should be able to cram that into what would be the middle lower leg. your knee would be his knee. his head would be well above yours, but with camera's and a television visor on, you will be able to see out. moving arms hands and neck all done by strings.
it would work i think. just like a mini version of mine, save i need my feet above the knee, or a full robotic kit waist down. you can still just suffer, net full range of movement, and look good without dropping tens of thousands of dollars, unlike me.
http://www.therpf.com/f24/has-anyone-attempted-life-size-x-men-sentinel-suit-128690/
good luck on your project. ill bookmark it. i love to steal ideas. and im betting you might solve some of my problems as you work on this one. thanks, and good luck!
ohhh edit: finished hulk... with limited movement:
http://www.youtube.com/watch?v=iKf46AlpndE
http://www.youtube.com/watch?v=ZmpVAOpwfyw&feature=fvwrel
same tech done better as a rock golem:
http://www.youtube.com/watch?v=UfpNapnElhE&feature=related
edit again: hulk made with shifting plates is a bad idea. rubber might be best. just keep the molds around to replace the parts once every 4 years. this person has experimented before you in this style. the comments section there says volumes.
http://www.youtube.com/watch?v=FwO6vWjSB0A&NR=1
further edit: i am sure of the 10 foot tall hulk. offical statue, and your desired "look":
http://www.youtube.com/watch?v=1c01fOxxk4k&feature=related
edit yet again..... those hulk statues are here and there, mostly at movie theatres.... scan one somehow in 3-d and that would solve alot of sculpting/mold problems.... but it would also be recasting..... sort of. no? yes?