Dear 30DodgePanel, Thanks so much for that. I have previously delved into GOOGLE's Patent database and I've dredged up many of Baverey's patents which your links provide. The difficulty is knowing which two to pick! (it's for a 1/2 scale ENV aero-engine) since for historical fidelity it needs to be accurate. It still seems that the only way to nail it is to find someone who can physically look at the actual ZENITH carb.
It's early days so the flame of hope still burns bright! Thanks again, Cheers.