90 lb is a pretty heavy plane, for that kind of wingspan. Are you sure? Is it the "recon" gear that makes it so heavy?
Did you consider using a heli instead? I was just reading about a heli mounted cam.
Helis are notorious for vibration, but they're more maneuvrable that a plane (I guess it depends on what kind of shots you're taking).
Otherwise, you're close to entering the "giant scale" class of models, which means you'd be past electric motors; you're looking at a lawn-mower grade engine!
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