I don't think so, but it depends.
I got a FOrtress after they went out of production, but only because they still had a dozen bodies knocking around the factory. I don't think they would build a body shape they no longer produce.
If the Corvette Proline has gone out of production, you would still be able to get that I reckon, as you could order a Corvette Standard with an alternative body wood (flamed maple) and different pickups.electronics or whatever. [EDIT: now seen confirmation that it HASN'T gone out of production]
I don't think you could get a Fortress any more. If they agreed, it would cost way above its market value to produce.