Boot you could swap out in minutes.
Sills are a given on any ford
Rear quarter could be a pain depending how far gone.

If you have the skills to DIY and fancy a project, or have sentimental attachment (tho if you did, why did you let it get that bad :P ) then why not.
But as a car thats just passing hands, not worth the energy IMO as you won't get the money back for your efforts on a standard 4door mk6