find a wrecked KA shell in same colour, weld in new panel in floor for VIN number, stamp it with VIN from the real car, get finance company to come look at it and declare no interest in the salvage. once done, cut out vin, scrap old shell, carry on as normal.

obviously remember to "age" the fresh paint by doing it shit and soaking the area with salt water to bring out some rust spots around the stamping marks to look legit!