Wouldnt say that the fuel smell is a common issue, the fuel tank is actually in the boot (behind the panel at the back of the boot) which is why the boot looks smaller than you would expect. Drop the lining down and check it out. Could be coming from any point in the fuel system in the boot.
Water by the jack could be boot lid seal, electric aerial or sunroof drain pipe. Getting behind the liner is easy enough down that side to check.
The paint code should be on the vin plate under the bonnet. There will be a 3 digit code (mine is 8M6) on there. From what I remember, there should be a chasis code, a transmission code, and the paint code.
No idea with the bonnet pull, but I wouldn't expect it to be a tricky job.
Clean up and lick of paint on the rad brackets and strut tops is what I'd do. As long as the strut towers are ok, then it shouldn't be anything to worry about.
As far as other things go, standard stuff to check out really, suspension bushes, ball joints etc. Very common issue is sticking calipers and slide pins on the brakes, so worth a look and regrease the slide pins. Check when last cambelt was done. It is a non-interference engine on these cars (mk1), so no damage will occur if the cam belt does break, it would just be inconvenient.