I want to like this, I really do - but it's just not special enough.
Standard brakes and cheap coilovers do not make a track car.
Some of the fit and finish looks a bit poor to - would be fine on a track car, but this clearly isn't.
I reckon without the graphics and in a lighter colour (i.e. not blacked out) it might look decent though.
EDIT - Sold at auction in March for £28k (!). But the description says the sellers had it 4 years, so clearly that fell through...
https://www.historics.co.uk/buying/auctions/2020-03-07/cars/ref-116-2010-bmw-z4-gt3-recreation-mrp/