Hello! Does anyone here have any exerience with the 'mother of all graphics' the 12x20 Folmer and Schwing Banquet? (Notice I did not include the word "speed.") Are there any kinks or quirks I should know about before trying to use one? Any recommendations for film, lenses etc...?

Lith film is cheap even in that size. You'll have to figure out developer and it's slow but it's cheap enough to let you shoot. I guess you could figure out all the kinks of such a large camera then switch to more normal film.