There was this company, i guess theyre still around called "hard knock" that made a small moped-sized chopper with a lifan cub clone motor - the kikker 5150.
It was dumb as all shit but you can still buy the springer forks from those for only $150:
http://hardknockgarage.com/?product=fork-narrow-springer-complete
That should be fairly easy to adapt to a puch.