I've done some tests with cooling. Just sitting on a flat surface playing and running visuals, my empeg reaches 46C/103F Deg. With a 100mm fan placed on top with a bit of a spacer (small CPU heatsink), blowing air into the top holes and over the case the temp drops to 37C deg.
With the same fan blowing down a funnel into the side holes it drops the temp to 37-38C.
It appears that if the case itself is cooled, the internal temp is assisted.

Hugo, there's a little fan header pin set near the PS input. is that permanently on or can it be switched?
I'd like to try internal cooling if possible. Need to find a quiet fan though.