I just bought this today, and I gotta say, I love it, both for the green minifigs (omg!) and because I loved Toy Story as a kid.
I read the part about the bendy pieces though, and I checked, and my mind was blown and my heart slightly broken.
Also, I got to do this. I can't wait to start using these heads on more characters. B)
As for the truck, I don't mind the jutting - I'd probably make the chassis wider to acommodate another minifig or some accessories on the side. I might make one like it in different colours. =D
Edit: I just tried sticking Ha-Ya-To's head on one of these torsos and it was like, stupidly loose. Any of you have this same thing with your army guy figs or is it my head just in crap condition?
e2: nvm, tested more heads and they work =\