I finally got around to taking some photos of my HTPC.
Here it is fully assembled in its Mini-ITX chassis
And here is the front bezel of the chassis (Power button w/LED, HDD LED, reset button – the big red one)
With the top off. Top tray holds the HDD.
And here’s all the guts. The middle board is the PMU I designed. It is controlled by the blue Arduino Micro on board.
Close-up of the PMU. The green terminal block on the right is power input. The block up top is the switched power (to RPi and HDD).