Hmm, that's quite reasonable. Are there any implications of running without the DPF?
Plus would a GTi grille retro fit the GT TDi grille? I assume everythings the same shape?
Only if the government change the current MOT regulations but its all speculation at the moment. No implications otherwise though; you're basically de-catting the car

Also you will eliminate any potential problems the DPF might run into; lots of documented problems about them not regenerating and burning off the soot they collect. Also some of the sensors can fail
Equally you should be able to run a remap without having to remove it which is what I'm currently doing. Should something happen then I'll remove it

Think you need the front bumper and a few other pieces; not 100%