>        y = llCos(Rot.x)*y - llSin(Rot.x)*z;
>        z = llSin(Rot.x)*y + llCos(Rot.x)*z;

This is not going to work, because you are setting the new "y" value in the 
first line, then using it in the 2nd line (but you should be using the 
previous y value).

Try something like

x2 = x;
y2 = llCos(Rot.x)*y - llSin(Rot.x)*z;
z2 = llSin(Rot.x)*y + llCos(Rot.x)*z;

x = llSin(Rot.y)*z2 + llCos(Rot.y)*x2;
y = y2;
z = llCos(Rot.y)*z2 - llSin(Rot.y)*x2;

x2 = llCos(Rot.z)*x - llSin(Rot.z)*y;
y2 = llSin(Rot.z)*x + llCos(Rot.z)*y;
z2 = z;

npos = <x2,y2,z2>;

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