Auto body repair & detailing: replacing wings on a mini, mike gallagher, paint world

Question
I have an E registration mini city and need to replace the wings as part of the restoration.
Where do I start and how difficult is this job ?

Answer
I need more information. I don't understand what a E registration mini city is.

                            Mike Gallagher
                            Gallagher Holdings
                            Paint World
                            1-800-548-4321