When producing a scale model do you have to scratchbuild a model in order to create beautiful scale realism? Because if you buy some kits e.g. Kyosho warbird, you do not get a 100% correct warbird, and obviously you need to be accurate before turning it into a scale model. How would i know it is correct for a face lift? (To be turned from an ordinary warbird and change into a replica scale model.

Please help with good information as i want to begin in scale modeling. Thank you very much for your help.