1) you are not registered under central excise, if regustred as as dealer then u had to pass on the CVD amount paid ( not full customs amount) to the actual owner now.
2) the capital goods you dont have in your capital assets so it does not qualify for your capital asset, but u r mere supplier of capital goods,
3) works contract act specify the input used in works contract and capital goods owned by you to perform the works contract makes u eligible for 50% CVD in 1st year and remaining 50% in subsequent years,
4) supply of capital goods does not qualify you to take input credit, here your role is mere a dealer or agent, not the owner of capital goods.