mu0p, that's a brilliant setup! Very close to what my band is trying to do. Here's what we have currently:
Macbook running audio & video in Logic
Another video running on a PC laptop, synced using Chain Gang
Lighting laptop with lighting sequence synced using MTC
It would have been perfect except for the jitter from MTC. I like your suggestion of the MIDI triggers and I'm going to try that out next. I also am considering using Compu Live to send the MTC to the other machines, instead of having Logic be the master.