Well, like I said, if they are rivets you can drill them out with extreme ease. Since you dont have a dril though, it wont be as easy for you.
You may need at least 8 clamps, depending on your setup. Are you going to have a T line or a resevoir or both? Lets say you are using a T line: You will need 2 for the waterblock, 2 for the pump, 1 for the fill port, and 3 for the T fitting. That is 8, if you are using a resevoir instead of a fillport, you just took out the need for two and 6 will be enough.
You may need at least 8 clamps, depending on your setup. Are you going to have a T line or a resevoir or both? Lets say you are using a T line: You will need 2 for the waterblock, 2 for the pump, 1 for the fill port, and 3 for the T fitting. That is 8, if you are using a resevoir instead of a fillport, you just took out the need for two and 6 will be enough.