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Regarding the "no originality" issue, let me give you my point of view. I don't think J's is trying to copy any of the wide body kits offered for the S2k. They are just inspired in the Super GT series, which is the pinnacle of Japanese GT cars. In fact all the designs you know are different interpretations of the series from each company(call it Amuse, ASM or Top Fuel).
If you compare this sketch to the Amuse kit that Prowler Orange posted, it looks almost identical to the Amuse kit with very small changes. It looks, to me, like they've just copied the Amuse kit and altered a few minor details and simply made a sketch of it. Nothing more or nothing less. After all, it's simply that, a sketch. Hell, if it is real, it could be totally different and not what we all expect. Sorry if this was redundant.