Well, you can do it a couple of different ways.
One way (and perhaps the easiest way) is thus: Since the camera footage you are using in Lightwave has a 3:2 pulldown cadence already added to it, you should work at 29.97 and treat it as regular NTSC footage (even though Lightwave will only render progressive, in this case 30p). Take this finished 29.97p movie into AE and render out an interlaced movie at 29.97i using the steps I outlined above. That way FCP will play it correctly without yet another render.
Another way, if you want to be bold, is to remove the 3:2 pulldown using cinema tools and leave yourself a 24p movie to use in lightwave. That way you will animate at 24p, render a 24p animation out of lightwave, and then use AE to interlace and add pulldown OR even better, put the finished 24p movie in an uncompressed 24p timeline in FCP and have your output hardware/FCP add the pulldown when laying off to tape. Every time 24p is mentioned here, the real frame rate is 23.98 (just to clarify).
What kind of capture and media hardware do you have for FCP and what format are you laying this off to?
Jeremy
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