I tried to find the internal dimensions of the FE100. We used to cook 170# {hoof weight} pigs on our Brinkmann Smokin' Pit.
Some alterations with a meat saw needed to be done. We split ours, took off the shanks, and head. The shanks we cooked in the belly, and the head we threw away.
I believe I saw Fred & Anna Smith cooking one on an FE100 in the Whole Hog division at the WPX BarbeQlossal.
Good Luck! Roger