I'm probably not the best person to ask about making a mobile set-up, considering how far removed from mobile mine is
Still I did have intentions of making the inlet a outlet connections dry breaks so I could use a portable pump/rad/res box.
An Eheim pump is good as you can run it either inline or submerged. They also don't require an impeller seal due to the design so there is much less chance of leaks.
not sure what size rad or water flow etc but all those pelts will take some power and generate a fair amount of heat. I think a peltier on the Northbridge is overkill myself. A lot also depends on how compact you need to make it.
The GF3 cooler is now nearing a retail kit but it is only designed for the Asus GF3 card. There should be a later reference GF3 card kit.
more details here, do note it is not my product, I just helped produce it.
Topic: Retail Asus GF3 water-cooler kit.... initial "Alpha"
I'm currently working on HDD coolers and water-cooling the PSU.....I'm after total silence myself.