If I were to purchase a 2DOF kit and later decide that the 3DOF is more to my liking, what would be the process of upgrading and how much of the equipment is interchangeable?

You keep the whole system you buy in the 2DOF kit and add to it. You send your electronic control box to us, we install a larger power supply and an additional controller. We then ship it back to you along with the additional actuator, the additional mounting hardware, and the yaw knuckle. Shipping costs are covered in your upgrade purchase and we will send the UPS guy to your house for the pickup. On the software side, the system will detect the new axis and prompt you to enable YAW....that's it.