when i had the car it cost a grand to get the bonnet done which included the cost of the original gti-r bonnet...in the end all they used were the side vents and the sparrow catcher grille. as far as i know they took a copy of the gti original, took a copy of the gti-r bonnet, put the 2 together, cut and smoothed the centre section of the R copy, cut the original gti bonnet in the centre, rivited the R copy to the gti copy... smoothed the whole thing bonded the 2 ontop of the original gti bonnet and then a lot of smoothing and then painting...took the owner 8 days to do said he spent the entire time on it...they usually make sidecars for motorbike racing and they did a good job...