Them there numbers would work with the sides that you're going to have. I just did a party for 40 folks. I had 16lbs PB, 18lbs of brisket flats and a friend did 3 slabs of LB ribs. I ended up with one half pan of meat left.
I experienced a little more carry-over heat than I had expected, so you might want to keep that in mind if your gonna FTC the brisket and PBs together.
Good luck!