Easy to add at least a full tonneau (although snaps have to be added up near windshield). A full tonneau will prevent most of rain from entering along with sun and prying eyes. Also makes warmer when driving in cool weather with 1/2 zipped. Cost probably $500 for Haartz cloth and std snaps. Top would use same snap point and need header and bows so near $1k (also need side curtains another $400).