That sounds like a fantastic modification to the Vermeer baler! Turning it into a practical cotton drivable harvester and baler capable of producing 150 cm round bales of 4000l is a significant upgrade. The addition of full AI support will make operating the machine more efficient, and the ability to change chassis colors adds a nice touch of customization.
Increasing the price slightly to account for the added features and capabilities seems fair, considering the enhanced functionality and improvements the modified Vermeer baler offers. Overall, this modification sounds like a valuable addition to the game, providing players with a versatile and efficient tool for managing cotton harvesting and baling operations.