Welcome to the forum. We have a DYI section for folks like you who want something different and are willing to build a motorized bike without using a kit. Check here for other innovators> http://motorbicycling.com/forumdisplay.php?f=36
Good luck with your project and keep us informed on your progress. Sounds interesting.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"