Why are you mounting your heatercore outside of that thing? You have a very large case, much larger than the average case, so why dont you put it on the inside? You are at the point where you are going to have to start hacking off some peices here and there to get thigns to fit. Plus, if you put your heatercore on the inside, you can use the air comming through it is sub cooling for some other things in it. You should have the whole thign entirely self contained, using one thing to cool another thign as much as possible. Just reuse the air as much as you can before it exits the case. Since it will be immediately used to cool the heatercore before it catches some heat, it wont have to cool anything too hard to cool, and will work. You could remove a front intake and use the fan on the front of the heatercore as an intake fan. An intake fan brings in air an cools something off, so why wouldnt that work? It will. Just mount other fans elsewhere. When you mount your fans onto your heatercore, make sure to use a shroud and back the fans off a few inches so there is room for the air to build up some pressure. You will get a higher airflow rate, and therefore cooler temps. Remember, every 1/4 of a degree here counts. Have one fan pushing air into the heatercore on one side, and the fan on the otherside sucking air out. If you are using two fans on each side, use the same idea.
I bought 10FT of tubing. Like Gaara said, you will need tubing for wrong cuts and mistakes and whatnot. It's better to buy too much than not enough. Plus you will use more tubing than you measured, because you have to take into consideration the bends of it. Tubing bends differently than a tape measure.
You can just get hose clamps for the tubing. As long as it clamps the hose, you need nothing more. All you need it to do is to clamp the hose and prevent water from comming out, so you wouldnt need anything special.
I bought 10FT of tubing. Like Gaara said, you will need tubing for wrong cuts and mistakes and whatnot. It's better to buy too much than not enough. Plus you will use more tubing than you measured, because you have to take into consideration the bends of it. Tubing bends differently than a tape measure.
You can just get hose clamps for the tubing. As long as it clamps the hose, you need nothing more. All you need it to do is to clamp the hose and prevent water from comming out, so you wouldnt need anything special.