I do a modified version but i put 1 1/2 #10 cans in a full size pan (along with all the other ingredients fills it up) and that serves 50 easily at about 8 oz PP.
4 full pans or 6 #10 cans should set you nicely.
Pitmaster @ Lockharts BBQ
I cook the best brisket north of Dallas. Get over it.
Northern midwest director for OBR
BBQ Person of the Year 2013