SUGGESTION:
dont use any copy of any windows os just laying around, it has to be a legal copy if its in a place of bussiness, or he can get in deep shit.
Just something to think about
and dell may have shitty parts but they are reliable and if it breaks, the blames not on you.
but if youre into expirimenting and he wants to learn how to do it then go for building one.
anyway, go back to the top of this reply and think about it