lol, hes not a paintwork man though is he... he prefers to go for a blast. than look pretty.
Anyway yeah id deffo get bonnet and rear bumper as rear bumper would be really cheap. arches are like £250 to get done properly so nothings to expensive its the engine what costs the money so i think you have done the right thing.
Get it into joes though for a service and set up just to be on the safe side...