Here's a photo of that completed model, if it helps.. You'll see that plasticard is completely un-necessary. Bear in mind that my army is themed "The Nameless" and I actually scratch off most symbols on my units except the Aquilla, so no decoration is the "theme" of my army. Their supposed story is that they are a completely intact legion that has been spewed forth from the eye of terror with almost no memory at all of who they are, or what their purpose is. They have a vague impression that the Emperor of Mankind is their Lord and Master, but there is also some dissent within the ranks about even that notion. I'm letting my wins and losses map out who and what they are or will become. I.E. I figure that if I lose a lot to Chaos, then I'll slowly begin weathering and corrupting them, etc. Wow, I just got off on a tangent. Anyway, here's a photo of that completed model, entirely in cardstock and like 1$ of fittings from Lowes:
EDIT: Even the "pistons" are paper, as in sucker sticks that you can buy from Michaels in the candy making section.