I also cut a hole in the floor and got the wiring inside the car today......I 've got a couple of plates made that will seal the opening in the floor and traps a rubber grommet around the harness as it comes thru the floor to seal everything ......I was trying to figure out where to fit the ECM and decided that I would mount it right in the middle of the firewall as I have a real neat touch screen radio that I have to build a mini console for so it will be hidden behind it........The radio is pretty cool.....Flip screen, touch screen, navigation system, satellite radio,audio and video CD player, and it has a camera built in for backing up......
I also have to put in the sound deadener before I get too far..........
Ken