Hi
Apart from converting the bike yourself, one of the best places I can think of is Hiroboy ( http://www.hiroboy.com/catalog/) I'm doing the YZR M1 2005 and I have bought most of my aftermarket parts from here, their prices are for me very reasonable( not sure were you are located). They are very very good at supplying items for Motogp or for giving you ideas for the things you will need, just keep an eye on their website. You could also check out http://www.modelersite.net/index.php for the builds that people have done.
Sorry that I can't help further at this point, I wish you luck and look forward to seeing the build.