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1. I do not want to say anything about this. If it works, then it works.
2. Unless you are going to expose your heatsink to the elements, corrosion should be minimal. Copper really corrodes under moisture. Since you hopefully will have no moisture in your case, then this is not a problem. If you are really worried about it, you can do a high school electrochem redox experiment with a car battery, your heatsink, and a solution of Ag+. This is a bit overboard.
3. My CPU fan blows towards the processor. In ATX, it is usual for the fans on the bottom to suck air in and the fans in the rear to hot air out. As for positive or negative air pressure, your case should have enough holes in it that it is nearly impossible to hold a non-equilibrium pressure. People will argue otherwise.
Hope this helps.
Respectfully,
Demosthenes
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