Evo, before you go too far, it would be wise to check whether the bike will be eligble.
In the current 2011 GCR's, under EVO Class elegibility is rule "18.7.12.1 Bikes will be OEM". I have always taken it that this rule, which call for bike to be Original Equipment Manufacture, prevents the use of one or specials in the class.
Of course, this rule may have been changed for the new 2012 rules.
CJ