Cough.. cough... cough...
175W in a mini-ITX case is called a fan heater, not a piece of electronics. There is no way in hell you can dissipate that amount of heat in that little space unless you are pushing all of it outside the case straight away which is not the case (the heatsink has vents on top and on the side in addition to the exhaust).
So frankly, if marketed for that it is mismarketed from the start. You simply cannot stuff something like this in a mini-ITX case even if you severely under-clock it.
It will end up with the usual suspects - the shorter size improves airflow in a normal gaming case too.