No £150k tops ther're not that uncommon to find delivery mileage and that one is prety low spec, cloth seats etc. My former business partner picked one up in 98 with 000025 miles only for £125k and Porsche UK sorted it for road use, he put about 20k on it before it had to be let go... Unofficially they cost Porsche over £1 million each to build, Sultan of Brunai had one converted to right hand drive, there is or was one that was made a convertable after the owner flipped it on a German autobharn and it was the cheaper repair!
In another rather special location I worked where exotics arrived and went after I preped them, one transporter arrived with an unrecoreded UK registered origional GT40 in Gulf livery, one of the two Maserati Boomerangs built and a 0 mileage 959... That was cloth inside too; I cannot remember the colour but I think silver or red....Yes I worked on all of them, sitting in the boomerang was probably what set me on the road to wanting a Maserati!!!
959's are really not good at low speed on the road; all nuckley & clunky as the drives and diffs try and sort it out but my goodnes they were lightning quick, on the track they would shoot flames on every change from the dumps and exhausts, that is where they are supreme...