It shouldn't really matter what scale you model it to as long as your textures and all detail are also to the correct scale.
Personally I'd model it at 1:1 scale if possible - since there's less chance of screwing something up later.
The other thing to take not of is how your camera is set up (and your DOF settings if using it) since getting this out of whack will definitely make it look as though you're shooting through a macro lens...
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