Well, I would backup everything ... build each walk path and save it ... then slowly add each to your scene. IF and only if that crashes then I would composite it. When you composite it you will lose proper lighting and shadows, unless that is unnecessary. May I suggest you use a comic book style? I know that sounds weird, but it uses fewer resources and yuo may be able to do more. Your client might even enjoy the idea.

Boni

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"Be Hero to Yourself" -- Peter Tork