In the meantime of not being able to find a turtledeck, why not build yourself a wooden pick-up box for the time being? That way you can drive/use the car until you find a decent turtledeck and you don't have to settle for beaten-up, rusted-out junk. You can find a set of plans and buy the hardware from suppliers for carriage builders. Don't forget to cruise the classifieds over on the HAMB, I see turtledecks over there more than anywhere else.