Ok The cooling system is very simply, but effective. It uses both pushing and pulling fans, whith airflow going out of the front and back of the laptop. This is how I hav arranged the cooling system fro my xbox laptop. I cut down the stock jasper heatsink so that it would fit into my laptop. I left the jasper heatsink without moddifying it (the one without a heatpipe and extra heatsink). I then installed them on the xbox normally. (With AS5 and x-clamp fix)
Then I built a custom fan duct out of foamex, that goes behind the gpu heatsink only, and then to 3 35mm fans at the rear, which are bllowing air out of the case (sucking it through the gpu). These 3 fans are connected the normal 12 fan plug, thus temp controlled. I then installed two 40mm 10mm thick slim fans ontop of the gpu, blowing air down onto it. These are connected to 12v. Then connect a slim sideway blowing fan from a normal laptop onto the top side of the cpu heatsink, this blows air across it. Connect it to a fan controller or 12v. This is going to be the loudest fan of them all.
This is the basic configuration of it, I have added a few more extra heatsinks with JB weld so I can decrease the speed of the cpu fan, making it queter. By having 2 fans blowing, and 3 sucking on the gpu, it will defintely keep it cool. I noticed the cpu heatink may get hot when under full load, so I have added another few ones onto it to keep it cool. Make sure there are plenty of vents, allowing air to exit the laptop. Also I spent ages making the gpu duct a tight fit as possible, so the 3 rear fans suck the air out well.
To see a little video of me explaining the inside of my xbox laptop, please go here:
http://www.youtube.com/watch?v=5UTDid0JG6E
Hope this helps!
Seb Smith