I saw this over on a different forum, had a quick look at the price and although it's an incredible mod (and one which has been requested for years) it's not for me.
Game Gear collecting is fun though, especially with the Master Gear!
GPD Win, GPD XD 64gb, PlayGo, RS-90, 3DS XL, DSi XL, GBA SP, GBBC Clone, Gameboy Pocket c/w screen mod, PSP Go
Medion Erazer, Toshiba Z20t, Dell Mini 9, Psion 5MX
Tons of other old laptops and tablets.....