You have to roughly have an idea of where everything is going. Before you mount ANYTHING you have to be sure that the hoses will be routed nicely, no kinks, and no sharp curves. You want nice gradual curves on the tubing, and as little tubing as posssible to decrease resistance and increase watrer flow.
With your heatercore, I made this mistake on mine, when mounting the fans make sure there is a little bit of space between the face of the fan and the heatercore. You will get better air pressure, resulting in more air flow. You could also get a quiter operation, but that is left to argument. You also cant rely on your fans and your pumps to produce all the noise. There are other noises, such as noise of air going through the heatercore, going through the case, airflow does in fact make noise.
With your heatercore, I made this mistake on mine, when mounting the fans make sure there is a little bit of space between the face of the fan and the heatercore. You will get better air pressure, resulting in more air flow. You could also get a quiter operation, but that is left to argument. You also cant rely on your fans and your pumps to produce all the noise. There are other noises, such as noise of air going through the heatercore, going through the case, airflow does in fact make noise.