i think this project might be alot more than your thinking it will be, since everything in a lappy is custom designed for the case itself, so it will be an odd shape so there will be room for hdd's and dvd drives, and almost no lappies will have replaceable gpus other than the high end lappy mobo's, that will prob cost you like 2-300 for the mobo alone since the new lappy will be like 1500+, might be able to get some for like 1k+