I had the same problem when I first tried making this suit. I'm not at all built like the guy in the model, so when I did the unfolds, I broke everything down into sections so it could be scaled independent of each other.
The leg is separate from the boot, the Abs section is separate from the chest/shoulders, and the arms are seperate from the body completely.
I learned a lot from how the veterans here on the RPF do their builds, so all the credit for the way I do things is completely theirs. I literally spent hours pouring over build threads before I bought my first pack of foam.
Honestly, I wouldn't have done half as well as I have if it weren't for guys like Stealth, XRobots, and Bill Doran at Punished Props (dunno if he's a member here or not).
Thanks to their willingness to share what they've learned through trial and error, I had a head start on tackling this.