Beauty is in the eye of the beholder and all, but for me that seat unit looks terrible on the bike.

If your going away from the standard, which actually I think still looks great, for a modern line look, then you need to go with something like the TYGA GP tail or the RS250 tail which Silikesguiness has fitted to great effect.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30