J's Garage is probably the best and most common place to roder these parts. japanparts.com had the doubleDIN dash part but no listed AC controller on their website. Grubbs had the doubleDIN dash piece and aluminum bracket listed on their webiste but no AC controller but now its not listed anymore for some reason.
There is someone over at g35driver.com selling his set of parts in the Audio/Video/Sat/Navi forum. Don't know if he sold it already, it was listed 3-4 days ago with some interested already.
MANY people have personally done the conversion with little to no problems. Others have had the conversion done professionally for a price.
Its nice to do since, IMO, the doubleDIN dash looks better and moreso, you have many more options to choose an aftermarket HU that suits your needs.
doc
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2004 G35c AT / DG / Graphite / Premium(-POS Bose) / Performance / Aero / Alum Pedals / Clear Corners w/PIAA Xtreme White / 6-Wire GroundingGear / Stillen HiFlow CAB / Z Tube / Stillen TD CB Exhaust (soon) / Hotchkis Performance Swaybars / Hotchkis Sport Coils / Passport 8500 / JDM v35 DoubleDIN Dash swap
Panasonic CQ DXE / MTX Thunder Amps x2 / Infinity Perfect 6.1 / Kappa 692.5i / Eclipse SE8363 / Infinity BassLink
DoubleDIN Conversion DIY guide:
http://www.g-owners.com/article_read.asp?id=33
"Never put sharp pointy objects on leather..."
g35driver.com ID: joepaniolo