Side mounting a BIX isn't a hard thing to do ... I did it. But then, I did it in a tower. 2 BIMs wouldn't do much good. They'd have to be run parallel to be effective (but 2 just might do it for decent temps) but the hosing and tackle involved would run him out of room.
Have you thought of this: Put a larger heater core bolted externally on the rear/side of the unit? External mounting is probably going to be a must here, but if you take a thin heater core and externally bolt it on, you might do well by that on your mini-case.
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