To help facilitate fitting the armor (both the paper mockup and the real one), I'm making a custom mannequin of myself out of paper tape. I used the kind that they use for shipping boxes, so you have to wet the adhesive before it will stick. After you apply 3 or 4 layers of it, it gets pretty stiff once it's dry. Since it's impossible for me to cover myself with tape, I enlisted the help of my wife who did a great job so far on the torso. We started this somewhat late, so we'll have to finish the arms and legs another day.
On a side note, who knew this project would be such a multi-disciplinary endeavor? Sewing, shoemaking, vacuum forming, mold-making, and now mannequins...whew! Thankfully, the mannequin will be reuseable for anything else I decide to tackle (maybe not literally, since it takes so damn long to make one. Badum CHING).