Yup, that's how value often works. A buyer would have the choice of driving it like it is or making it a rather involved project car. As a project car, taking on a righthand drive Z in the US would add to the fun/drama. Much would depend on the restoration skills of the buyer, how much work would have to be "farmed" out, the depth of the budget, or all three. It's easy to look at the pictures of the car and realize that if you you were willing to pour $50,000 into it's restoration, you could end up with a very nice $25,000 Z.
So, the value? For me maybe $5,000 as a daily driver novelty (unusable at drive-up bank ATMs or fast food pick-up windows) if it really is structurally solid and mechanically sound with just paint patina.
Dennis