I've been told that it's a pretty involved process, the 6th gens with OEM navi have a different windshields than non-nav versions, I assume for an attenna or something. I've also heard there's sensors that need to be installed etc..
The dealer charges $8000 to install NAV on a non NAV car, I know dealers are overpriced but at that price, that should tell you something.
Good luck, and as far as aftermarket not looking good, what aspects don't you like? Here's a pic of my setup:

I have a 2005 Nissan Maxima SL and I saw your Navigation System setup and I'm in love with it. Can I please get some information regarding how it was installed? Thanks

It's a pretty standard install, once you get the single din kit, cut it to double size and the rest in all straight forward. Anything specific you need to know?
Oh and thanks!!

Yes, D3 with all listed
I moved the oem screen to the bottom and replaced it with a 7" tft screen
The install was a mix of professionally done personal touches. I had the main unit installed but I moved the screens around myself...

Hope this helps!!

I have the Metra dash kit, The screen i have is a NESA, it's good because there are no buttons on the front so it fits snug. You'll also need the PAC adapter for the steering wheel controls to still work...
Yeah the D3 is a great unit!!

Good luck!

http://www.amazon.com/dp/B000E...e=asn

Pioneer In Dash Navigation (AVIC-D3)
iPod Direct Control Cable (CD-1200)
Universal Rear-View Camera (ND-BC2)
Metra 2004-2006 ISO Din Head Unit Provision With Pocket (99-7404)
Steering Wheel Control Interface For Pioneer/Sony (PAC SWI-PS)

Thank you for all of your help and please let me know if I’m missing anything.

Post pics when you are done!!

You can leave the stock screen up top and the rear view will come on the D3 when you reverse. The D3 will not fit up there, there's a cross support bar that's in the way. And the 6cd has to come out. Seriously though if you have your IPOD filled up you won't even miss the changer, I have all my music and movies on the IPOD. I don't even remember the last time I used the disc player which is good because the navi disc has to come out to do so...

Well since you have an 04 the match is almost perfect. The 05's and up went to a brushed look but the metra stayed smooth like ours. $2000 WTF does that include the head unit and all parts as well? The screen move is really easy, I did that part myself. I had my HU installed for $150...

As for the clean cut, the dremel is your friend...

Yes, the stock system comes out completely, you have to remove the changer/tape deck to fit the D3 anyways this is the main "brain" of the stock system. The 7" screen up top plays DVD's (same as the headrest monitors) and I have an RCA switch hooked up so the rear view shows with the flick of a switch (also it shows on the D3 in reverse) Otherwise with the D3 you get a blue screen (due to no dual zone) Prior I had an N2 and you could display the NAVI up there which was great but when I got the D3 I never checked to see as I assumed they wouldn't remove this feature (pretty much the only drawback thus far) So yes I have the GEX-P920M for XM, the info screen still works for the climate control and mileage etc...just no stereo info shows. And you don't have to extend the wire it does reach...

The problem with our cars is that not many people/installers have messed with it so they have no idea what they are talking about...

And don't worry my wife thinks the same!!

Nope, I have no idea what he is talking about, makes no sense. And i wouldn't go as far as BMW, I've heard some horror stories about that "german engineering"!!

And as for the screen you nailed but like I said when I had the N2 it would show the NAVI screen and it was perfect. So now I do run the rear view most of the time or tune it off so it's not just a blue screen.

Another great site to check is http://www.avic411.com, everything you need to know about these head units...

Yeah like I said Metra only made the 04 version, I'd paint it, I just painted my whole dash blk, looks way better (mine was getting all scratched anyways)

The PAC SWI-PS will get you your steering wheel controls but the PAC OS-2 is for an OnStar Interface which is on Gm vehicles...

Thanks man, there's always hope even for the 6th gen!!
The stock brackets hold the HU in place.
I had a guy change them all out, there's hundreds of tiny LED's that need to be soldered in one by one, not sure what bulb they are but they are tiny.
The bumper is from http://www.bodykits.org (originally the redlinemax bumper)
Sides are stock and the rear is an '07 bumper....

Hope this helps!

4.08 VLSD, NICO 8-way ECU, full exhaust with custom headers,
Tokico Blues with Eibach springs, Stillen FSTB, 20mm RSB, 255 rear rubber.
Of course I forgive you. That is your God's function. Your crime is forgiven.
However, your stupidity requires a response." -Leto Atreides II

Yes it will but if you have a lip spoiler you will have to have holes filled in. I got mine off EBAY for $170 painted and shipped, great deal, great quality...

Sorry for the delay! I have 9 Luxer LEd's in the footwells. Ans yes I replaced the red lenses with wht and put LED's in there as well. The blinkers are switchbacks from autolumination.com

Hey thanks!! and thanks (for your service!)