post the pictures each panel -doors, fenders & rear hatch, some of members can surely guide you to replace or get fixed from a better place
in 1st place anything rusted, broken or shredded replace it. Mehran panels are economical to replace. Paint JOB will be surely expensive depending upon shop & quality you choose - Baked paint for suzuki mehran Burney autos in KHI is charging 40,000.
one FX under rebuilt am waiting for a proper EFI engine to put in, sometime back estimate for paint only was 35,000 from ICI shop in Karachi main Korangi road,