Pics to show what I got done yesterday:
1) ...connected 40A fuse holder to the "power bar", farthest to the right, in front of fuse panel under the hood
2) ...routed wire in corrugated tubing and fed under battery in the three clip channel with other harness to the rubber grommet and harness at the firewall
3) ...where it comes through into the footwell. No, I didn't leave the wire exposed in the footwell like in the pic...took the pic right after feeding it through.
I didn't take a pic of where it ends up, but it is currently under the rear seat with corrugated tubing covering all of what leaves the rear side panel. No, there is no fuse in the holder yet.