Thanks G-Man! I admit I did limited research before the Mexican Vienna Lager I brewed, and that's been a while ago. I recall reading Zainasheff, some BYO or Zymurgy, and a little web surfing of articles and recipes, and then forging ahead based closely on Zainasheff.
Barriers are broken all the time, and norms change. My experience is limited to only one Mexi-vienna-lager in the Negro Modelo style, but it did turn out very well.
I'd be interested to hear how yours turns out if you go 24% corn.