I haven't modded my DS like this myself, but I've seen a lot of mods on the net that are pretty impressive. These are some that I've found on QJ.net that I thought people would like to see.
Looks pretty cool, I'm going to replace my black DS lite case since the hinges broke, going to be a clear case. I'm trying to decide if I want to put in some LEDs to spice it up a bit, I might. I kind of want to have the option to disable the LEDs, so I'll have to integrate a small switch.
There will not likely be a tutorial for the giant screens, despite the webpage being rather descriptive. I forget the link to the webpage, search for something like "jumbotron ds." It uses an FPGA, 2 of those new touch screen computers--I can't remember what they are called, and some other stuff I don't remember.
By the way, FPGA are not user friendly from my understanding.