I think the colour coding looks good, a light coloured GTI with the black rear bumper just looks like all the lesser models, but not in black of course (which I have!). if you look at any other make of car hardly any have unpainted rear skirts these days.
however I think the red stitching on the interior makes it look cheap.
as for if you can order a ED30 with GTI bodykit, no chance and a waste of time in my opinion, just buy a normal GTI and add some nice extras with all the money you have saved. the extra 30HP is great and a nice luxury, but not that necessary in what is already a great car.
order an RNS 510 touchscreen sat nav, the dogs bollox!