ghelmer, I don't know if Max 3 has this feature, but check out your "advanced effects" rollout under your light properties. If it has an "ambient only" option (check box), then that should give you the same effect as Z-tooning on any model with no shadows and should render a little quicker. Plus, you can put other lights in the same scene if you wanted, and it's not dependant on camera position. This is available in Max 5 and 6 I know for sure, but not certain about 3. Also, you might wanna look around for the 'Ink N Paint' material, but I don't think version 3 has that one either. Anyway, cool effect! Nice job.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.