Model the booking + quarterly-instalment schedule most Karachi off-plan projects (Emaar / HMR style) use.
Indicative schedule only. Real developer plans vary (milestone vs time-linked, ballooning instalments, discounts). Before booking any off-plan property, confirm the exact plan, the developer's delivery record and the project's NOC / approval status with a Zell advisor — off-plan is the highest-risk purchase in Pakistan.