Well if he bought the parts before it broke down (which I'm assuming he did as he already has all of the sound system) then there's no point putting it off, it's not like he's coughing out more money that could right now be going to fixing it, and I'm sure he just wants to crack on and do what he can while he can, seeing as the mechanic won't make it round til tomorrow (today?), he's just bought the car, all he wants to do is play around with it, christ. I was/am in the same boat