OMG rear wheel spokes help!!!

Holy Mother of the Unholy...  I am now over $500 just trying to put a disc brake setup omy chopper.  I know all the easy answers, cycleexchange, ebay, different websites, but am wondering DOES ANYONE KNOW ANYTHING ABOUT LACING A 1975 OR 1976 cb750 SUPER SPORT
(DISC BRAKE) HUB TO A 16 INCH DROP CENTER (Harley) RIM ???  The spoke kit I bought for the cb750 drum brake to 16 inch Harley don't work.  ANY help?  Anyone done it and know what 'spoke kit' I need???  OMG, if you give me the place to buy it so I can end this nightmare conversion there will be $20 to you in the mail!!!  HELLLLLLLP!  randy in kolorado