As nearly every body panel is still readily available, they should do the frontline thing and go for a rebodied Mazda option. Probably be far more successful as you're replicating a car with secondhand values upwards of £60K rather than £5K.

1972 4/4 4 seater, 1981 MGB GT
1984 Harley Davidson Electra Glide, 1990 Kawasaki ZX10