Radar, I just installed the MS-8 today as well. Not nearly as nice as yours, great job!
Question for you: How did you wire the inputs to the MS-8? I am using the high level inputs (coming from factory nav HU) but the MS-8 does not see the rear speakers. If I put the amp in 2 ch mode they come on so I know they are fine.
Where'd you get the sub enclosure? That really looks awesome!