Second, the contract should stipulate in detail how much deposit to pay in the first phase, how much to pay after the mid-term delivery and how long to pay in the last phase.
Third, quality requirements, according to the samples you provide, the detailed delivery location, the number of the first batch of goods per day or the number of days after the next day, and who is responsible for rework and scrap caused by quality problems, such as deducting more than% processing fees for one day of delayed delivery.
Brother, I wish you success.