From the pics, it look to have been done well, but you would need to stand in front of it to be sure.
£50k, its a steal and I recon you would get it for that if you pushed.
Take the graphics off, possibly paint the bonnet in time and source some lights, its not much of a list now is it.
You may even find that it got smashed on the track...doing what it was designed to do.
Also, you should be aware, VOSA centres are due to be gotten rid of so there will be no way to asses CAT C marker cars, so its not inconceivable that the CAT system will be dropped in time anyway.
Life's too short, you buy it cheap, you have your fun, you sell it cheap, whats the issue?
It's not a true 4 seater mate. It's a 2+2.
The beauty of all Maserati's for me from the Coupe to current models is that they are true 4 seaters than can carry 4 adults across continents in comfort and style. There is no way in say a 993 that you could do this. When I drove a mates Targa I struggled to even get into the thing with the drivers seat in its most rearward position. The 991 may be different and offer slightly more room but why do you think they build the Panamera as more of a GT car.
I know a forum member who offered a few grand below what they were asking and was told to shove it!
I would say the Strad market has gone up...mind you, all the same ones are for sale so they are not selling.