I did some looking around and all I found really were people talking about doing one. So these are just ideas and thoughts for now. When I got more time, I will see if I can dig anything else up.
One idea was to go to a ag dealer with your sprockets and see what you can find that will match with little modification. Belts would be cheap here too, well cheaper than say, a harley belt. Probably.
The chain guard on the engine will probably need to be removed.
Nothing yet on actual kits or plans yet though.
The ride IS the adventure. The destination is just to get gas!