I can help with a few since I just did an install myself:
You can ground the camera to any ground spot on the car. Add as much to the wire as you need to get it to any of the metal bolts exposed in the hatch area.
The SWC wires are the ones that send the steering wheel control signals; there is a pos and neg.
The SWC wires for the base stereo are pin 6 and 16 on the vehicle harness (not the metra or whatever aftermarket adapter harness you're using).
Sorry, I'm not familiar with the JVC wiring as I have a Pioneer and it has a 3.5mm jack so no need to use the one that came with the ASWC.
One thing someone else noticed is that if you get only volume controls from the steering wheel, then you need to switch around the wires you tapped into.
Good luck!
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