Certainly lots of surgery involved - the fuselage will have to be shortened in front of and behind the wings, the wing span will be reduced, too, and two engines omitted. Landing gear will also have to be modified from the bogies to simpler twin wheels, and I am not certain if the fin and the stabilizers need changes, too. As per usual, a conversion that sounds simple at first calls for many detail mods...
I am also not settled for an operator yet. IIRC, the kit comes with Pan Am markings, which I basically like, since this aircraft with probably 80-100 passengers lends itself to a feederliner role.