Hi here are a few tutorial photos of how attache the a Snake armor and paint.
First you can use velcro, chicago screw, rivets and belt with clip or small buckles. Basically i used all of them. Depend $$ and time. After that i apply puttty where is need it, specially for those drill hole for the screw.
Then small sanding (220 sand paper) and primer.
If you see very close the photos of the real Snake Eyes armor and helmet (Real photos of the real Snake eyes check gallery and other RPF thread) it is not smooth, it has a rough stone texture on the armor that is why you dont need to sanding alot.
For making that effect i used RUST OLEUM AMERICAN ACCENTS STONE.
Appy a good coat evently, let the armor dry for 24 hours in a cool dry place.
Then paint them black (i prefer matte or satin). I hope this info help you for those asking me.