That looks great! I have a rotisserie for my gasser but I really need a ring that will fit a kettle. Loin is hard to get moist due to the lack of marbling but it looks like you nailed that.
One comment on the cord. I see you have an overhand knot at the connection to keep it from coming apart. I'd leave it unknotted so that if someone trips over the cord, they don't pull the grill down.