Howard, what size of "life-size raptors" are you gonna build? The 60 lb. Velociraptor Mongoliensis, the 160 lb. Deinonychus, or the monstrous Utahraptor, which weighed a ton at 9' tall and 20' long? Or, you could just make up your own size, like Spielberg did, in JP. Whatever you do, though, my recommendation is to not give them feathers. I realize there's new evidence out there that these (and many other therapods) may have been feathered to some extent, but in my opinion, the addition of feathers to a dinosaur seriously detracts from its coolness.
The Wook