the current net profit margin stands at around 10%, so there's reason to believe the management will be able to achieve similar margins as long as they control their contract cost well. after all, it does not look good on the company if you are unable to maintain your margins. I believe 3%-5% is a target for initial only. management will slowly bring up the margin over the contract period. and it is a good sign that management has unlocked such a huge contract. it is a sign of confidence from China.