Rust on the doors and wings as well. Remember, panels such as the bonnet and rear flat back are NLA. Like the headlights. And...etc. The final killer will be rust on the bulkhead - that's what's always terminal for old Ghiblis.
I assume it isn't actually a Cup? It has the badge, but that was an easy retro fit at the time, though is now NLA (obviously). I assume not, as wrong wheels and wrong fuel cap.
The reg number on the collection paperwork doesn't show up on the DVLA database either. Or am, I reading it incorrectly?
I'd say it needs to be very cheap. Even at free, if the rust has taken hold, by the time you've stripped the car, remade panels, rebuilt it, repainted it, etc, the repair cost could be more than its eventual value. Especially given that a really nice condition and original Ghibli (non-Cup) is only mid-teens.
If it is a real UK RHD Cup, its a 50% chance it's my first one, as from memory they only made two in silver.