I was one of the first to buy. I still have mine, and I'll probably keep it until the light dies. With the DS, though, I guess it's silly to keep it. The form factor works just as well and it plays the old games. The best part about the old GBA was its wide shape for my big hands, but the DS has that anyway. Oh well. I keep it because I can.
I still wonder if Triton labs sold their idea to Nintendo... it was awful convenient how TL switched from some guy and his hobby site to a music producing studio overnight

Anyway, back to the thread, good luck with the retrofit. After installing a few afterburners... here's my overall opinions
1. Not much space in there to work with
2. you'll have to dremel out some of the plastic somewhere
3. The solder points aren't that hard to get to for the power, so that's something at least.