A method and apparatus for harvesting cotton including a cotton accumulator configured to accumulate cotton removed from cotton plants. A feeder system of a cotton harvester is configured to move independently of the cotton accumulator and along a longitudinal direction. A round module builder system is configured to move along the longitudinal direction toward the feeder system, wherein the round module builder includes a contact member adapted to contact the feeder system to establish a working gap between the feeder system and the round module builder. A wrap floor is moved toward and into contact with the feeder system, which is spring biased to maintain a substantially consistent gap between the between the feeder system and round module builder. Cotton is directed toward the round module builder and a directing mechanism directs a wrap for wrapping the directed cotton into a round module.