So is the big trunk bad, or good? Depending on what the display is showing, having teh space might be great, but store floor footage can be pricy.
I agree that to look authentic and be clear what it is, you kind of need from a wheel well backward, which would include having part of a roof too.
Is this is a"Cost not important" kind of project? Just finding a good back half of the car from that vintage and cleaning up it to look nice could be $$$.