yeah, that's partly what I'm referring to. I'm wondering if the thermal junctions present in a normal case don't actually help lower junction temperature though. For example, in this design, the air around the fins provides a much higher thermal impedance than say the bottom of the case. But since it's all one large block of aluminum, it seems that natural convection to air would be sort of a "last resort".
Also, if you've ever heated up a block of aluminum, you know it takes forever to cool down via natural convection. I'm wondering if the internal temperature will rise dramatically as well, despite any attempts to add holes for natural heat convection.