That sounds sweet! Cosplay armor that you could take into combat. That would scare the crap out of the enemy
If you know how to use it and it will work for this type of built, no sense in learning something new that will get the same result. Since I work with Sintra, I choose this costume because the curves are compatible with it. There is no way I would attempt a Halo costume or something with tons of sharp corners. It would be too time consuming and a waste of material. So I think the material picks the costume. And since you said ABS is good for forming curved plates...it sounds like a winner for a costume like this.
Straps...
I haven't gotten too deep into researching it, but this is how I see it at the moment:
The back and sides will be one piece and will be straqed to me like a backpack (strap for each arm and one around my belly). The chest piece will snap or hook to the front of the back straps and maybe velco where the two meet. The neck armor (I just finished forming and sanding last night) will tuck under the chest armor and over the back armor with velcro. The waist will be 2 pieces and have a built in belt. Overlapping at the hips, so it can expand as I do
The upper thigh will have a strap that can connect to the belt. The knees will be like knee pads and the shin will be connected to the boots. The forearms will be fine with foam and hopefully the upper arms aswell. Due to the fact that I might want to sit down, I might not make a butt plate...or I might just make an independent plate for each cheek like in Spaceballs. The shoulders will be the hardest part. They need to sit on the very edge of your shoulder and cantaliever out a foot or two. I think I'm going to have to add something to the neck armor that extends way out past the shoulders that the armor can rest on. They also have to pivot, so I might connect them to the armor with hooks or something.
So in general, I'm seeing straps, velco, snaps/buttons and hooks. But it's still in the early stages, I might think of something else.
The under armor will be black. Don't know what yet, but I'll try to find something with some kind of texture.
I have templates of everything I've made so far. Here is the templates for the Helmet and Shoulders in full size (PDF):
http://www.4shared.com/file/87316292/e56fad87/helmetPDF.html
http://www.4shared.com/file/87316291/7c66fc3d/shoulderPDF.html
Remember, these are just MY templates. Use them 'as is' or to help you create your own. And feel free to post pictures of your armor.
Whenever I get down about trying to get the accuracy just right, I remember a story I once heard about a time when Charlie Chaplin held a 'Charlie Chaplin look-a-like contest'. He seceretly entered the contest and came in second place. You just can't win!
Besides, I've noticed 4 different versions of this armor from the CREATORS alone.
EDIT: Fixed links