Project X Underway. Need some guidence

[lchen]

Hi,
I am about to start Project X which includes the following:
1) Invision DVD Headrest Rev IIG
2) Invision TV Tuner (1 composite input for additional video source like ipod video, ps2, digital tv tuner...etc)
3) NavTool Video Module with 2 video inputs
4) Dice BMW Ipod Kit (Non-Silverline, so I can have ipod clickwheel access to activate ipod movies)
5) Dice Video Cradle (to watch ipod movies on nav screen)
6) More-Eyes CCD Nightvision Backup Camera
I have a 2004 BMW X5 with Navigation and CD Changer.
Here are some questions I have.
1) Where can I tap 12v switched power for the NavTool video module?
2) Where can I tap 12v switched power in center console for Invision Headrest DVD? I read that the cig lighter are constant in
bmw x5.
3) Where can I tap 12v switched power for the backup camera?
4) I see alot of people using a relay for the backup camera. The NavTool video module has 2 video inputs. Video1 is for any
video source, but video2 is dedicated to a backup camera and has 2 wires that trigger it when the car is put in reverse.
NavTool states that their video module has a video chip instead of a relay built in so I didnt know if I still needed it.
Here is the site to the product: http://www.tvandnav.com/index.asp?Pa...PROD&ProdID=40
This will be my first attempt so please be detailed.
Any help would be greatly appreciated as well as any suggestions you may have.
I will try to take some pictures of my progress as well as update this post or create a new post after the install.
I am looking forward to any help I can get.

One last thing, since the invision dvd headrests will have a tv tuner with an additional input, will it be possible to output what's playing on my navigation into the headrests so that we all watch the same movies from the ipod video?
I prefer to connect the ipod video to the main navigation thru navtool video module and then output it to the headrest.
How can this be accomplished?

Also, how the heck do you remove the 3 pin behind the cd changer? I have been trying, but the wire is so short I cant get all the way behind there. The plug doesnt seem to want to come out. Is there a certain way to remove it?

Thanks again,
Lc