When I hear 4×3 full frame I immediately thing they are saying 1.33 FF.
Funny, Fox Home Video insisted on this format until about 2 years ago for all of their domestic home video tv spots. Thank god that’s over.
But yes, basically if that’s what you want, and your camera guys shot for 16×9, you’ll need to do a center punch and then pan/scan every shot. Doesn’t sound like fun.
I don’t understand what’s so bad about letterbox. I’d get more clarification from them.
Joey