GT4 Mk1 and Mk2 are great but not flawless.
Way too long gearing and not the 'real engine' the GT3 RS has are two of them.
And for me that makes it a no go....
I think the Cayman GTS 4.0 is maybe even the more fun car(less wide tyres, more playable)
In a world where everything was possible I'd order an M2CS in a heartbeat AND a 991.2 GT3RS (or GT2RS), GT4 not so much....
But anyway congrats to your Father in Law. Great car off course.
Cheers
Robin