I have read your mail and your project sounds interesting. Both Aun and you have experience within construction. If you have all 3 units (twinhouses) in progress/under construction at the same time, but with different progress rate (100 %, 70 % and 50 %), and you have to finance the construction yourself (with help of credits from supplies and friends), it can be risky if you run out of cash/finance. Is it right understood that you first get paid when the house/unit has been sold (you have the risk yourself to find a buyer to the house)? Is it you land (and you have to pay for the land before the house is sold)?
How much cash do you need? I can not promise to help you, but let me know more about the project. How much do your estimate the profit is for you on each unit and what is the cost (building ++++) for the unit?