i found a website where someone had fitted a gameboy advance sp into a gameboy pocket and dmg shell, does anyone have the link because i cant seem to find the site again.

That was Cennar, his site went down, though.

Search for the "Portable-Palooza" thread, my entry was a GBA SP is a DMG shell with a ton of extra features, and I have also put a GBA SP in a GB Pocket, but took it back apart to scavenge the SP lcd for the frontlight.