Would be interested to know your thoughts on the above 142 as I may go down that route still.
I wouldn't. That car is ridiculously overpriced for what it is. Unless you're handy with a welder, fabrication, and painting, there are a LOT of billable hours in properly repairing that rust in the RH sill and door jamb.
And if the rot is in there is that bad, safe bet is it will be in the rest of the sill and maybe the floor, too.
The upholstery at the top of the rear seat is sun affected and is falling apart; that will need a re-trim. There appears to be corrosion on the inside of the RHF wheel arch. Mudflaps are missing. The dash top is cracked, the LHF seat belt looks tatty, the boot looks dirty, the bonnet is dented with a rust mark, the carpet is worn and faded.... and that's just from what can be seen in the pics. $7,500? JHC on a stick, these things rolled off the showroom floor for $4,400!
Both of the 142s I've bought in the last few years have each been less than one-tenth of that asking price, and been in better shape. Thanks to the P1800 enthusiasts, engine and most mechanical parts are still available since many are shared with 140s. But replacement body parts and panels are getting harder to find now, since the 140s didn't get as big of a fan base as 240s and weren't really loved by many, unfortunately.
Premium prices are for premium examples. A $7,500 140 should not require any body work whatsoever, should run flawlessly, have a very tidy interior, and should have rego in most states. Yes, even in these days of COVID Tax.
Presuming you picked up that example on Carsales for its true present value ($400, and that's being generous), expect to spend at least another seven grand to get it running, registered, and reliable, and it will run forever if properly maintained (which isn't hard). But IMHO only do that if you're really fond of these things; don't expect to get your money back.
7.5K should get you a reasonably clean and tidy 242GT; 15K should be spotless. Much more than that and the car is either rebuilt, &/or tastefully modified (e.g. with a turbo engine), &/or very low kays and babied, or it has a crackpipe price like this 142.