You'll have a lot of work on your hands in terms of sanding and detailing and much more user error involved. It's a wide spectrum, this armor creation thing - one that starts somewhere with all high definition Pepakura and less artistic investment and ends in sculpting and molding your own armor:
I shall include a diagram for thee:
HD Pepakura, Less Bondo, Low Artistic Creation --> LD Pepakura, Lots of Bondo, More Artistic Creation --> No Pepakura, All Sculpting, Pure Artistic Creation
Something like that. So like ImaGonnaGetYou said, it depends on what you're looking for. Technically, anything's possible if you have the will and the skill.