$50 per hour is minimal for me to do this plus fuel and prep stuff. You are increasing your liability by letting them provide the meat though.
I was asked to do one of these and I charged a flat fee of $500. I did not get the job though.
Peace and Smoke,
My Weapons: Custom rig - Kandi, UDS; Bubba Keg; 22.5 WSM x 2; 18.5 WSM; BWS extended party; BWS Gator and an Onyx Oven; 29' ft Coachmen Leprechaun (Lola).
Dan Chambers get well soon, so we can tell you to "Shut up Chambers"