It's a nice looking case, but the problem I see is where are you drawing air into the system to cool it? Unless the window is removable with a proper mesh screen to keep dust from getting into the system, the box is going to get pretty hot for all components.
Is it a reverse air flow design? Maybe air flows in through the back, through the CPU cooler, then through the power supply and out the bottom?
PR said that the power supply was backwards, but I believe you're right. The builder needs to turn around the rear fan and CPU fan to use the PSU for exhaust. The PSU should be able to take the heat from so small a CPU.
Would it not make a lot more sense to use an SFX PSU? For such a small system it's unlikely you can get above the 450W that a good SFX PSU offers, though I think there are higher rated ones either on their way or out already.