Ford Escort RS Cosworth 5 door replica

[drumandbass2016]

Hi! I'm a new member here so not quite sure where to post this, but I'm exploring the possibility of a Escort RS Cosworth replica. However, I can't find any decent 3 door, pre-facelift mk5s. and it then occurred to me that most of the kit would fit on a 5 door, which would be more practical for me anyway. The part I would struggle with would be the side skirts and the flared rear arches. Could these be modified to fit a 5 door? If so, how would one go about that? I only really have experience with engines and interiors, not bodywork.