I was actually planning on making it perfectly air-tight with caulk or something similar during fabrication.
Usually dead spots form in a larger case because of the size of the case, with something so small getting in a lot of pressure, the energy in the moving air has not been expended and as such it will continue to move.
It was a different thread in these forums but Psyclum and I were talking of air pressures and how air moves through a case. Air will pick the route of least resistance and the choices for the air are:
1) Go back through intake rads
2) Go into a wall
3) Go through the 80.2 rad.
The cooling force depends largely on the fin density and cfm output of the intake and the fin density of the 80mm rad. I am interested in keeping it quiet so I was planning on using the SR-1 series of rads as I could run the fans slower.