Under the Option B payment should be the implement CE value. If the Subcontractor had taken longer than its forecast then the same would apply because the risk sits with them.
Yes, under the Option D the Target (Prices) would be adjusted by the value of the implemented CE, the Subcontractor would be paid its Defined Cost + Fee (PWDD) and the difference would be reflected in the calculation of the Subcontractor's share. The risk/reward being shared.
Yes, under the Option D the Target (Prices) would be adjusted by the value of the implemented CE, the Subcontractor would be paid its Defined Cost + Fee (PWDD) and the difference would be reflected in the calculation of the Subcontractor's share. The risk/reward being shared.