Well just to up-date here, that i emailed this same rotor question to the USA supplier - Moto x industries - and they have replied back that my stock OME WRR rotor WILL bolt directly onto the Warp 9 hub....
They state that the Warp 9 wheel set uses the same hub on both the R & X version, and that the bolt pattern for the rotor mounting is designed the same as per the stock WRR hub. ( Which is why for the X models the stock OME front rotor will NOT bolt up to their supplied hub, therefore they supply their own larger 300mm rotor if ordered as SM wheels for the WRX model ).
So in short, if the W/9 front wheel set is ordered as the MX style for the WRR, then it comes with the standard diameter WRR front rotor - which is mounted to the hub using the same bolt pattern as per the stock OME rotor. Therefore, according to them, the stock WRR OME rotor can be fitted straight on.
I forgot to also ask if their supplied rotor on the WRR MX wheel set is a "floating" type rotor as per the stock WRR. I suspect that it would be a "solid / fixed" mount rotor. I'm still in discussion with them on other details, so i may still ask this question.
Anyway it would still be good if anyone here with direct experience can confirm on this 100% - but it sounds as though the guys at Moto - x - industries have fairly good product knowledge on this subject.
I'm very close to pulling the trigger on this wheel set, so i suppose if i do go ahead then i'll find out for myself on the definate facts regarding rotor mounting, lol. ( I will up-date this thread if i do purchase ).
It seems now that the only other major decision is on the colour combo options for the W/9 wheel set...
I'm considering the Billet blue hubs with S/S spokes & black rims... My only concern is how the black rims would match on my 2012 WRR, which has the standard silver finish on the alloy frame, sub frame & swing arm etc. I know that black can be matched ok with pretty much any colour combo - but what do you guys think about this combo ?? ( I have seen the pic of this colour combo on "Tonymorr's" bike in the for sale section - but i'm open to comments / photos / other suggestions on colour combo's etc ).
Thanks for hanging around if you've made it this far into the rambling, lol.
Cheers guys.