My PSU expects both constant and switched 12V. Of course if your PC is in the trunk you just connect the constant 12v input straight to the battery terminal which is also in the trunk.
For switched 12V, you can get it from the BMW harness (red wire). Note that this is only for trigger and does not need to support much ampage, may be 100-200 MA. So you could also tap into the 12v input going to the amplified antenna inside the c-Pillar, this would be closest 12V switch to the trunk.
As for the diagram, Are you keeping your factory amp or planning to use an after market?
If you keep the OEM amp then I am not sure how your 7.1
sound output is going to work with it. All you need to connect to SVEN4 are four RCA cables: two for front and two for rears speakers. There is no separate channel for subwoofer which you mentioned in your diagram.
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