I am eager to see your setup.
There are couple of other posts here in the forum about RAM installs.
I also have a RAM 1500. I have completed my carpc install.
Regarding your setup, sounds cool... If your CarPC will be permanent, something you might want to consider... an inverter will work great for testing/setup your CarPC install, but sooner or later you will want the DC power supply. I too started out with an inverter as the power supply for my CarPC (M10000 mini-ITX/GPS/Lilliput/etc...) but moved to an OPUS 150 DC power supply which powers all my CarPC components and works very well for "auto-power-on" when I crank and "auto-power-off" when I get out of the truck. If your CarPC will be permanent, you'll probably want to go this route sooner or later.
I created a custom CarPC case for my mini ITX board. I made the computer case out of a metal keybox (from IKEA) with a dremmel tool. The case stores the mother board and a 40GB laptop drive. All components needing power are powered by the nearby Opus DC powersupply. All CarPC components + Opus are stored between the rear wall of the truck and the metal fold out rack under the driver-side rear passenger seat of Quad Cab.
Be sure to post your progress.