First Person View - Hands

[REI]

I need to get control of the arms (the joints) using external devices. I do not need the entire body but only the arms, as we know them from every FPS-Game.. The professional models are not required.
This is a major project which have to be implemented with this engine, to which I (think) already come up against the limits (first of all the env.-lighting).
My idea was to gain access to the single parts of the body and hide them, which unfortunately does not seem to work..